Problem:
 Score : 100 points    Problem Statement There are S sheep and W wolves.  If the number of wolves is greater than or equal to that of sheep, the wolves will attack the sheep.  If the wolves will attack the sheep, print unsafe ; otherwise, print safe .      Constraints  1 \leq S \leq 100  1 \leq W \leq 100         Input Input is given from Standard Input in the following format:  S  W       Output If the wolves will attack the sheep, print unsafe ; otherwise, print safe .        Sample Input 1 4 5      Sample Output 1 unsafe  There are four sheep and five wolves. The number of wolves is not less than that of sheep, so they will attack them.       Sample Input 2 100 2      Sample Output 2 safe  Many a sheep drive away two wolves.       Sample Input 3 10 10      Sample Output 3 unsafe

Solution (Python):
s, w = map(int, input().split())
if w >= s:
    print("unsafe")
else:
    print('safe')

Solution (Python):
s, w = map(int, input().split())
if w >= s:
    print("unsafe")
else:
    print('safe')

Solution (Python):
S,W=map(int,input().split())
if S<=W:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S,W = map(int,input().split())
print('unsafe') if S <= W else print('safe')

Solution (Python):
x =list(map(int,input().split()))
if x[0] <= x[1]:
    print("unsafe")
else:
    print("safe")

Solution (Python):
hitsuji, okami = map(int, input().split())

if hitsuji <= okami:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int, input().split())

if(s <= w):
    print('unsafe')
else:
    print('safe')

Solution (Python):
N=input("").split(" ")
S=int(N[0])
W=int(N[1])

if S<=W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = map(int,input().split())

if S > W:
  print('safe')
else:
  print('unsafe')

Solution (Python):
s,w=map(int,input().split())
if s<=w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int, input().split(' '))

if w >= s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S, W = map(int, input().split())

if  S <= W:
        print("unsafe")
else:
        print("safe")

Solution (Python):
S, W = map(int, input().split())
if W >= S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int, input().split())
print("unsafe" if w >= s else "safe")

Solution (Python):
S,W = map(int, input().split())

print("safe" if S > W else "unsafe")

Solution (Python):
s, w = map(int, input().split())

if s > w:
  print("safe")
else:
  print("unsafe")

Solution (Python):
s,w = map(int, input().split())
ans = ['unsafe' if w >= s else 'safe']
print(ans[0])

Solution (Python):
def main():
    S, W = map(int, input().split())
    print("safe" if W < S else "unsafe")
    return


main()

Solution (Python):
s,w=map(int,input().split())
if w>=s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
import sys

readline = sys.stdin.readline
readall = sys.stdin.read
ns = lambda: readline().rstrip()
ni = lambda: int(readline().rstrip())
nm = lambda: map(int, readline().split())
nl = lambda: list(map(int, readline().split()))
prl = lambda x: print(*x ,sep='\n')

s,w = nm()
print('unsafe' if s <= w else 'safe')

Solution (Python):
S,W=input().split()
S=int(S)
W=int(W)
if S<=W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s, w = map(int, input().split())

if s > w:
    print("safe")
else:
    print("unsafe")

Solution (Python):
ARGS=input().split()
S=int(ARGS[0])
W=int(ARGS[1])

if S > W:
    print('safe')
else:
    print('unsafe')

Solution (Python):
s, w = map(int, input().split())

if s > w:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S,W=map(int,input().split())
if W >= S:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S, W = map(int, input().split())
if S <= W:
  print('unsafe')
else:
  print('safe')

Solution (Python):
def resolve():
    s, w = list(map(int, input().split()))
    if w >= s:
        print('unsafe')
    else:
        print('safe')
resolve()

Solution (Python):


A, B=map(int,input().split())

if(A<=B):
    print("unsafe")
else:
    print("safe")

Solution (Python):
sw=list(map(int, input().split()))
s=sw[0]
w=sw[1]

if w>=s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w =map(int,input().split())
if s<=w:
  print('unsafe')
else:
  print('safe')

Solution (Python):
S, W = map(int, input().split())

if W >= S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int,input().split())
if s <= w: print('unsafe')
else: print('safe')

Solution (Python):
s, w = map(int, input().split())

if s <= w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int, input().split())

if(s <= w):
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int, input().split())
if w >= s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s,w = map(int,input().split())
print("unsafe" if s <= w else "safe")

Solution (Python):
s,w = (int(x) for x in input().split())

if s > w:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S, W = map(int, input().split())

if S > W:
    print('safe')
else:
    print('unsafe')

Solution (Python):
import sys
input = sys.stdin.readline

import numpy as np

sw = np.array([int(x) for x in input().split()])
ans = "unsafe" if sw[1] >= sw[0] else "safe"
print(ans)

Solution (Python):
s, w = map(int, input().split())
if s <= w: print('unsafe')
else     : print('safe')

Solution (Python):
s,w=map(int,input().split())
if w>=s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
a, b=[int(yy) for yy in input().split()]
if b>=a:
	print('unsafe')
else:
	print("safe")

Solution (Python):
S, W = [int(x) for x in input().split()]
if W >= S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
a, b=[int(yy) for yy in input().split()]
if b>=a:
	print('unsafe')
else:
	print("safe")

Solution (Python):
a, b = [int(a) for a in input().split()]
print("unsafe" if a <= b else "safe")

Solution (Python):
def main():
    S, W = map(int, input().split())
    un = "un" if W >= S else ""
    print(un + "safe")


if __name__ == "__main__":
    main()

Solution (Python):
S,W = map(int,input().split())
if S > W:
    print('safe')
else:
    print('unsafe')

Solution (Python):
s,w = map(int, input().split())
if w >= s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S, W = map(int,input().split())

if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w=map(int,input().split())
if s>w:
    print("safe")
else:
    print("unsafe")

Solution (Python):
s,w=map(int,input().split())
if s<=w:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = map(int, input().split())
print("unsafe" if S<=W else "safe")

Solution (Python):
S, W = map(int, input().split())
print("unsafe" if S<=W else "safe")

Solution (Python):
S, W = map(int, input().split())
if S <= W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
a,b=map(int,input().split())
if a<=b:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s,w = map(int,input().split())
 
if s <= w:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s,w=map(int,input().split())
if w>=s:
  print('unsafe')
else:
  print('safe')

Solution (Python):
s, w = list(map(int, input().split(" ")))
if w >= s:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s,w = map(int,input().split())
if s <= w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S, W = map(int, input().split())
print("unsafe" if S <= W else "safe")

Solution (Python):
S, W = map(int, input().split())

if S <= W :
  print('unsafe')
else :
  print('safe')

Solution (Python):
import sys
def ISI(): return map(int, sys.stdin.readline().rstrip().split())

s, w =ISI()
if s>w:
	print("safe")
else:
	print("unsafe")

Solution (Python):
S,W = map(int,input().split())
 
if S <= W:
  print('unsafe')
else:
  print('safe')

Solution (Python):
b = input()
a = b.split(" ")
c = int(a[0])
d = int(a[1])
if d >= c :
    print("unsafe")
else:
    print("safe")

Solution (Python):
S,W = map(int, input().split())

if S>W:
  print('safe')
else:
  print('unsafe')

Solution (Python):
S, W = [int(_) for _ in input().split()]

if W >= S:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s,w=map(int,input().split())
if s<=w:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S, W = map(int, input().split())

if S > W:
	print("safe")
else:
	print("unsafe")

Solution (Python):
S, W = map(int, input().split())

if S > W:
    print("safe")
else:
    print("unsafe")

Solution (Python):
s,w = map(int,input().split())
if w >= s :
    print('unsafe')
else :
    print('safe')

Solution (Python):
from sys import stdin, setrecursionlimit


def main():
    input = stdin.buffer.readline
    s, w = map(int, input().split())
    if s <= w:
        print('unsafe')
    else:
        print('safe')


if __name__ == "__main__":
    setrecursionlimit(10000)
    main()

Solution (Python):
S,W = map(int, input().split())
if W >= S:
	print('unsafe')
else:
	print('safe')

Solution (Python):
S,W = map(int,input().split())
if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S, W = map(int, input().split())
if W >= S:
  print('unsafe')
else:
  print('safe')

Solution (Python):
l = list(map(int,input().split(' ')))
S = l[0]
W = l[1]
if (W>=S):
	print("unsafe")
else:
	print("safe")

Solution (Python):
S, W = map(int, input().split())
 
print("unsafe" if W >= S else "safe")

Solution (Python):
def main():
    S, W = map(int, input().split())
    print("safe") if S > W else print("unsafe")


if __name__ == '__main__':
    main()

Solution (Python):
S, W = [ int(i) for i in input().strip().split(' ')]
if W >= S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int, input().split())
if s>w:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S, W = map(int, input().split())

print("unsafe" if W >= S else "safe")

Solution (Python):
S, W = map(int, input().split())

print("unsafe" if W >= S else "safe")

Solution (Python):
il = [int(k) for k in input().split()]
S = il[0]
W = il[1]

if S <= W :
    print("unsafe")
else:
    print("safe")

Solution (Python):
import sys
def input(): return sys.stdin.readline().rstrip()
def main():
    s,w=map(int,input().split())
    if s<=w:
        print("unsafe")
    else:
        print("safe")

if __name__=='__main__':
    main()

Solution (Python):
sheep_str,wolf_str= input().split()
sheep = float(sheep_str)
wolf = float(wolf_str)

if sheep <= wolf:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S,W=map(int,input().split())

if S > W:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S, W = map(int, input().split())

if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S,W = map(int,input().split())

if W >= S:
    print("unsafe")

if W < S:
    print("safe")

Solution (Python):
import sys
input=lambda: sys.stdin.readline().rstrip()
s,w=map(int,input().split())
if w>=s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
SW = input()
SW = [int(i) for i in list(SW.split())]

if SW[0]<=SW[1]:
  print('unsafe')
else:
  print('safe')

Solution (Python):
s,w = map(int, input().split())

if w >= s:
    print("unsafe")
else:
    print("safe")

Solution (Python):
a,b=map(int,input().split())
print("unsafe" if b>=a else "safe")

Solution (Python):
s, w = map(int, input().split())

if s > w:
    print("safe")
else:
    print("unsafe")

Solution (Python):
def solve(string):
    s, w = map(int, string.split())
    p = "" if s > w else "un"
    return p + "safe"


if __name__ == '__main__':
    import sys
    print(solve(sys.stdin.read().strip()))

Solution (Python):
S, W = map(int, input().split())
result = ""

if S <= W:
    result = "unsafe"
else:
    result = "safe"

print(result)

Solution (Python):
s, w = map(int, input().split())
if s <= w:
    print('unsafe')
else:
    print('safe')

Solution (Python):



import sys
import math
from bisect import bisect_right as br
from bisect import bisect_left as bl
sys.setrecursionlimit(2147483647)
from heapq import heappush, heappop,heappushpop
from collections import defaultdict
from itertools import accumulate
from collections import Counter
from collections import deque
from operator import itemgetter
from itertools import permutations
mod = 10**9 + 7
inf = float('inf')
def I(): return int(sys.stdin.readline())
def LI(): return list(map(int,sys.stdin.readline().split()))

s,w = LI()
if w >= s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S, W = [int(x) for x in input().split()]
if S > W:
    print("safe")
else:
    print("unsafe")

Solution (Python):
def main():
    s, w = map(int, input().split())
    if s <= w:
        print("unsafe")
    else:
        print("safe")
    return


if __name__ == "__main__":
    main()

Solution (Python):
S, W = list(map(int, input().split()))
if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
sheep, wolf = map(int, input().split())

if sheep <= wolf:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = list(map(int, input().split()))
if S <= W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
def main():
    S,W=map(int,input().split())
    if S<=W: print('unsafe')
    else: print('safe')
    return

if __name__=='__main__':
    main()

Solution (Python):
S, W = map(int, input().split())
print("unsafe" if W >= S else "safe")

Solution (Python):
S,W=map(int,input().split())
print("unsafe" if W>=S else "safe")

Solution (Python):
S,W = map(int,input().split())
if W>=S:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s,w = [int(x) for x in input().split(' ')]

if w >= s:
    print("unsafe")

else:
    print("safe")

Solution (Python):
S,W=map(int,input().split())
if S<=W:
  print('unsafe')
else:
  print('safe')

Solution (Python):


s, w = (int(x) for x in input().split())

if w >= s:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = map(int, input().split())

if W >= S:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = map(int, input().split())

if S <= W:
  print('unsafe')
else:
  print('safe')

Solution (Python):



s, w = map(int, input().split())

if s <= w:
    print("unsafe")
else:
    print("safe")

Solution (Python):


s, w = map(int, input().split())

print('unsafe' if w >= s else 'safe')

Solution (Python):
s,w = map(int,input().split())
 
if w>=s:
  print('unsafe')
else:
  print('safe')

Solution (Python):
s, w = map(int, input().split())

if s <= w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S,W = map(int,input().split())

if S <= W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s,w = map(int, input().split())
if w >= s:
    print("unsafe")
else:
    print("safe")

Solution (Python):
import sys
import math

S,W = list(map(int,input().split()))

if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
import sys
from collections import deque
import copy
def main():
    S, W = map(int, input().split())
    if S <= W:
        print("unsafe")
    else:
        print("safe")

if __name__ == '__main__':
    main()

Solution (Python):
s, w = map(int, input().split())
if w >= s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s, w= map(int, input().split())
if w >= s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S, W = map(int, input().split())
print("unsafe" if S <= W else "safe")

Solution (Python):
s,w = map(int,input().split())
if w >= s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s,w=map(int,input().split())
print("unsafe" if w>=s else "safe")

Solution (Python):
s,w = map(int,input().split())
print('un'*(s<=w)+'safe')

Solution (Python):
A,B = map(int,input().split())
if A>B:
  print("safe")
else:
  print("unsafe")

Solution (Python):
S, W = map(int, input().split())
    
    
    
if S > W:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S, W = map(int, input().split())
if S <= W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S,W=map(int,input().split())

if S<=W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
a,b = map(int,input().split())

if a > b:
  print("safe")
else:
  print("unsafe")

Solution (Python):
import math
import time
from collections import defaultdict, deque
from sys import stdin, stdout
from bisect import bisect_left, bisect_right
s,w=map(int,stdin.readline().split())
if(w>=s):
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = map(int, input().split())
if W >= S:
    print("unsafe")
else:
    print("safe")

Solution (Python):
import sys
 
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
 
S,W = map(int, readline().split())
 
 
if S > W:
  print('safe')
else:
  print('unsafe')

Solution (Python):
s,w=map(int,input().split())
print("safe" if s>w else "unsafe")

Solution (Python):
s, w = map(int, input().split())
 
if w >= s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
def main():
    S, W = list(map(int, input().split()))
    
    print("unsafe" if S <= W else "safe")
    pass

if __name__ == '__main__':
    main()

Solution (Python):
s,w=map(int,input().split())
 
if w>=s:
  print('unsafe')
  
else:
  print('safe')

Solution (Python):
a,b=[int(x) for x in input().split()]
if b>=a:
	print("unsafe")
else:
	print("safe")

Solution (Python):
a, b = [int(a) for a in input().split()]
print("unsafe" if a <= b else "safe")

Solution (Python):
s, w = map(int, input().split())
if s <= w:
  print('unsafe')
else:
  print('safe')

Solution (Python):
s,w=map(int,input().split())
if s<=w:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S, W = map(int, input().split())
if S <= W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = map(int,(input().split()))
if(S>W):
  print("safe")
else:
  print("unsafe")

Solution (Python):
S,W =  (int(i) for i in input().split())

if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int,input().split())
 
if s <= w:
  print('unsafe')
else:
  print('safe')

Solution (Python):
s,w=map(int,input().split())
if s>w:
    print('safe')
else:
    print('unsafe')

Solution (Python):
def main():
    s,w = map(int, input().split())
    if w>=s: print("unsafe")
    else: print("safe")

main()

Solution (Python):
s,w=map(int,input().split())
print('unsafe' if w>=s else 'safe')
exit(0)

Solution (Python):
s,w=map(int,input().split())
print('unsafe' if w>=s else 'safe')

Solution (Python):
a = input().split()
s = int(a[0])
w = int(a[1])

if w >= s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
nums = [int(e) for e in input().split()]

if nums[0] <= nums[1]:
    print('unsafe')
else:
    print('safe')

Solution (Python):
a, b = [int(a) for a in input().split()]
print("unsafe" if a <= b else "safe")

Solution (Python):
A,B=input().split()
if(int(A)<=int(B)):
    print("unsafe")
else:
    print("safe")

Solution (Python):
s, w = map(int, input().split())

if s <= w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int, input().split())
print("unsafe" if w>=s else "safe")

Solution (Python):
s,w=map(int,input().split())

if w>=s :
    print('unsafe')
else :
    print('safe')

Solution (Python):
s, w = list(map(int, input().split()))
if s <= w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
i = list(map(int, input().split()))

if i[0] <= i[1]:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = list(map(int, input().split()))
if w >= s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S, W = map(int, input().split())
if W >= S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w= map(int, input().split())
if w >= s :
    print("unsafe")
else:
    print("safe")

Solution (Python):
s, w = map(int, input().split())
print("safe" if s>w else "unsafe")

Solution (Python):
[S, W] = list(map(int, input().split()))
if W >= S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S, W = map(int, input().split())
if W >= S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w=map(int,input().split())

if w>=s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
a, b = map(int, input().split())
if a <= b:
  print("unsafe")
else:
  print("safe")

Solution (Python):
import itertools
import math
import fractions
import functools
s, w = map(int, input().split())
if w >= s :print("unsafe")
else: print("safe")

Solution (Python):
s,w=map(int,input().split())
if w>=s:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s,w=map(int,input().split())
if s<=w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S,W = map(int,input().split())
print(("safe","unsafe")[W >= S])

Solution (Python):
s,w = map(int, input().split())

if s > w :
  print('safe')
else :
  print('unsafe')

Solution (Python):
S, W = map(int, input().split())

if S>W:
  print("safe")
else:
  print("unsafe")

Solution (Python):

S,W = (int(x) for x in input().split())

if(S > W):
    print('safe')
else:
    print('unsafe')

Solution (Python):
s, w = map(int, input().split())
if w >= s:
    print("unsafe")
else:
    print("safe")

Solution (Python):
def main(s, w):
    if s > w:
        return 'safe'
    else:
        return 'unsafe'


if __name__ == '__main__':
    S, W = map(int, input().split(' '))
    print(main(S, W))

Solution (Python):
s, w = map(int,input().split())

if w>=s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S,W = map(int, input().split())
if W >= S:
  print('unsafe')
else:
  print('safe')

Solution (Python):
S, W = list(map(int, input().split()))
if W >= S :
    print("unsafe")
else:
    print("safe")

Solution (Python):
s, w = map(int, input().split())

if w<s:
  print('safe')
else:
  print('unsafe')

Solution (Python):
i = list(map(int, input().split()))
if i[0] > i[1]:
	print("safe")
else:
	print("unsafe")

Solution (Python):
s, w = map(int,input().split())

if s > w:
  print('safe')
else:
  print('unsafe')

Solution (Python):
s,w = list(map(int,input().split()))
if s<=w:
  print("unsafe")
else:
  print("safe")

Solution (Python):
def actual(S, W):
    if W >= S:
        return 'unsafe'

    return 'safe'

S, W = map(int, input().split())

print(actual(S, W))

Solution (Python):
s,w = map(int, input().split())
print('safe' if s>w else 'unsafe')

Solution (Python):
s,w=map(int,input().split())
if s>w:
    print('safe')
else :
    print('unsafe')

Solution (Python):
s,w=map(int,input().split())
if s>w:
    print('safe')
else :
    print('unsafe')

Solution (Python):


import sys

INF = 1145141919


def solve(S: int, W: int):
    return 'unsafe' if W >= S else 'safe'


def main():

    sys.setrecursionlimit(10 ** 6)

    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    S = int(next(tokens))  
    W = int(next(tokens))  
    print(solve(S, W))


if __name__ == '__main__':
    main()

Solution (Python):
S,W = map(int,input().split())
ans="unsafe"

if(S>W):
    ans="safe"
    
print(ans)

Solution (Python):
S,W = map(int,input().split())

if S <= W:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S,W=map(int,input().split())
if W>=S:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s,w = map(int, input().split())

if w >= s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S, W = list(map(int, input().split()))
if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int,input().split())
if s > w:
  print("safe")
else:
  print("unsafe")

Solution (Python):
s, w = map(int, input().split())
if s <= w:
  print('unsafe')
else:
  print('safe')

Solution (Python):
S, W = map(int, input().split())
if W >= S:
    print("unsafe")
if W < S:
    print("safe")

Solution (Python):
s,w=map(int,input().split())
if s <= w:
  print('unsafe')
else:
  print('safe')

Solution (Python):
S,W = map(int,input().split())
if W >= S:
  print("unsafe")
if W < S:
  print("safe")

Solution (Python):
S, W = (int(x) for x in input().split())

if int(S) <= int(W):
  print("unsafe")
else:
  print("safe")

Solution (Python):
def main():
    import sys
    input=sys.stdin.readline
    s,w=map(int,input().split())
    if s<=w:
        print("unsafe")
    else:
        print("safe")
if __name__ == '__main__':
    main()

Solution (Python):
S, W = map(int, input().split())
if W >= S:
  print('unsafe')
else:
  print('safe')

Solution (Python):
n,m =map(int,input().split())

if n <= m:
  print('unsafe')
else:
  print("safe")

Solution (Python):
s,w=map(int,input().split())
if s>w:
  print('safe')
else:
  print('unsafe')

Solution (Python):
S,W=map(int,input().split())
if W>=S:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int, input().split())
if w >= s:
 print("unsafe")
else:
 print("safe")

Solution (Python):
a,b=map(int,input().split())
if a>b:
    print("safe")
else:
    print("unsafe")

Solution (Python):
s, w = map(int,input().split())
if w >= s:
  print('unsafe')
else:
  print('safe')

Solution (Python):
s, w = map(int,input().split())

if(s <= w):
    print("unsafe")
else:
    print("safe")

Solution (Python):
S,W=map(int,input().split(" "))
if S>W:
  print("safe")
else:
  print("unsafe")

Solution (Python):
s,w=map(int,input().split())
if w<s:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S,W=map(int,input().split())
if S <= W:
  print('unsafe')
else:
  print('safe')

Solution (Python):
s, w = input().split()

if int(w) >= int(s):
  print('unsafe')
else:
  print('safe')

Solution (Python):
S,W=map(int,input().split())

if S<=W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
S,W = map(int, input().split())

if S <= W:
  print('unsafe')
else:
  print('safe')

Solution (Python):
S, W = map(int, input().split())
if S <= W:
  print("unsafe")
else:
  print("safe")

Solution (Python):
S, W = map(int, input().split())

if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int, input() .split())
if w >= s:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = [int(n) for n in input().split()]
print('unsafe' if S <= W else 'safe')

Solution (Python):
s,w=map(int,input().split())
if s > w:
  print('safe')
else:
  print('unsafe')

Solution (Python):
nums = [int(e) for e in input().split()]
if nums[0] > nums[1]:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S, W = map(int, input().split())
if S <= W:
  print("unsafe")
else:
  print("safe")

Solution (Python):
s,w=map(int,input().split())
if s > w:
  print('safe')
else:
  print('unsafe')

Solution (Python):
s,w = list(map(int,input().split()))
print('unsafe' if s <= w else 'safe')

Solution (Python):
s, w = map(int, input().split())

if s > w:
    print("safe")
else:
    print("unsafe")

Solution (Python):
S, W = map(int,input().split())

if (W >= S):
    print('unsafe')
else:
    print('safe')

Solution (Python):
S,W=map(int,input().split())
print("safe" if S>W else "unsafe")

Solution (Python):
s,w = map(int,input().split())

if w>=s:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s, w = map(int, input().split())
if s > w:
  print("safe")
else:
  print("unsafe")

Solution (Python):

S, W = map(int, input().split())
if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w=map(int,input().split())
print('un'*(s<=w)+'safe')

Solution (Python):
s,w=map(int,input().split())
if s>w:
  print('safe')
else:
  print('unsafe')

Solution (Python):
s, w = list(map(int, input().split()))

if w >= s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int, input().split())
if s <= w:
  print("unsafe")
else:
  print("safe")

Solution (Python):
def solve(s,w):
    if w>=s:
        return "unsafe"
    else:
        return 'safe'


s,w = map(int,input().split())
print(solve(s,w))

Solution (Python):
s, w = map(int, input().split())
if s <= w:
  print("unsafe")
else:
  print("safe")

Solution (Python):
import itertools
import math

s, w = map(int, input().split())
if s <= w:
    print("unsafe")
else:
    print("safe")

Solution (Python):
def main():
    s, w = map(int, input().split())

    if s <= w:
        ans = 'unsafe'
    else:
        ans = 'safe'

    print(ans)


if __name__ == "__main__":
    main()

Solution (Python):
a, b = map(int, input().split())
if a <= b:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s, w = map(int, input().split())
if w >= s:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int,input().split())
print("safe" if s > w else "unsafe")

Solution (Python):
s,w=map(int,input().split())
if s<=w:
  print("unsafe")
elif s>w:
  print("safe")

Solution (Python):
s,w=map(int,input().split())
if s>w:
  print("safe")
else:
  print("unsafe")

Solution (Python):
s,w = map(int,input().split())

if s>w:
  print('safe')
else:
  print('unsafe')

Solution (Python):
S,W=map(int,input().split())

if S>W:
  print('safe')
else:
  print('unsafe')

Solution (Python):
s,w=map(int,input().split())
if s<=w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w = map(int,input().split())
print("safe") if s>w else print("unsafe")

Solution (Python):
s,w = map(int,input().split())

if(w >= s):
  print('unsafe')
else:
  print('safe')

Solution (Python):
a=[int(i) for i in input().split()]
if a[0]<=a[1]:
    print("unsafe")
else:
    print("safe")

Solution (Python):
a=[int(i) for i in input().split()]
if a[0]<=a[1]:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s, w =  map(int, input().split())

if s<= w:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s,w=map(int,input().split())
if s <= w:
    print("unsafe")
else:
    print("safe")

Solution (Python):
S, W = list(map(int, input().split()))

if(W >= S) :
  print("unsafe")
else :
  print("safe")

Solution (Python):
a, b = map(int, input().split())
print("unsafe" if a <= b else "safe")

Solution (Python):
s,w = [int(i) for i in input().split()]
if s <= w:
  print('unsafe')
else:
  print('safe')

Solution (Python):
def resolve(S: int, W: int) -> str:
    if S <= W:
        return 'unsafe'
    else:
        return 'safe'

if __name__ == '__main__':
    S, W = map(int, input().split())
    res = resolve(S, W)
    print(res)

Solution (Python):
def resolve(S: int, W: int) -> str:
    if S <= W:
        return 'unsafe'
    else:
        return 'safe'

if __name__ == '__main__':
    S, W = map(int, input().split())
    res = resolve(S, W)
    print(res)

Solution (Python):
s, w = map(int, input().split())

if s <= w:
    print("unsafe")
else:
    print("safe")

Solution (Python):
s, w = [int(x) for x in input().split()]

if s > w:
    print('safe')
else:
    print('unsafe')

Solution (Python):
S, W = map(int,input().split())
if S <= W:
    print('unsafe')
else:
    print('safe')

Solution (Python):
val = input().split()

sheep = int(val[0])
wolf = int(val[1])

if (wolf - sheep) >= 0:
    print("unsafe")
else:  
    print("safe")

Solution (Python):

import sys


def solve(S: int, W: int):
    print("safe" if S > W else "unsafe")
    return



def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    S = int(next(tokens))  
    W = int(next(tokens))  
    solve(S, W)

if __name__ == '__main__':
    main()

Solution (Python):
s,w=map(int,input().split())

print("unsafe" if w>=s else "safe")

Solution (Python):
s,w = map(int,input().split())

if s <= w:
    print('unsafe')
else:
    print('safe')

Solution (Python):
s,w=map(int,input().split())
if w>=s:
  print("unsafe")
else:
  print("safe")