Harryxun/stf_run huggingface dataset:
import numpy as np
s = list(map(int, input().split()))
n=s[0]
a = np.array(list(map(int, input().split())))
s = list(map(int, input().split()))
q=s[0]
ans={}
for i in range(q):
    s = list(map(int, input().split()))
    if not (s[0],s[1]) in ans:
        a=np.where(a==s[0],s[1],a)
        ans[(s[0],s[1])]=np.sum(a)
        print(ans[(s[0],s[1])])
    else:
        print(ans[s])


### FIXED CODE ###

import numpy as np
from collections import defaultdict

s = list(map(int, input().split()))
n=s[0]
a = np.array(list(map(int, input().split())))
s = list(map(int, input().split()))
q=s[0]
num=defaultdict(int)
ans=0

for i in a:
    num[i]+=1
    ans+=i

for i in range(q):
    s = list(map(int, input().split()))
    a=s[0]
    b=s[1]
    ans=ans-a*num[a]-b*num[b]
    num[b]=num[a]+num[b]
    ans = ans+b*num[b]
    num[a]=0
    print(ans)
n=int(input())
m=int(input())
num=1
for i in range(n):
  if num<k:
    num*=2
  else:
    num+=k
print(num)

### FIXED CODE ###

n=int(input())
m=int(input())
num=1
for i in range(n):
  if num<m:
    num*=2
  else:
    num+=m
print(num)
a,b=map(int,input().split())
import math
c=a*b//math.gcd(a,b)
print(c)


### FIXED CODE ###

a,b=map(int,input().split())
import fractions
def lcm(a,b):
  return a*b//fractions.gcd(a,b)
print(lcm(a,b))
n=int(input())
a=list(int(input()) for i in range(n))
if a.count(max(a))==1:
  for y in range(n):
  	if a[y]==max(a):
  		a.remove(a[y])
  		print(max(a))
  	else:
  		print(max(a))
else:
  for i in range(n):
    print(max(a))



### FIXED CODE ###

##C
n=int(input())
a=list(int(input()) for i in range(n))
b=sorted(a)

for i in range(n):
    if a[i]==b[-1]:
        print(b[-2])
    else:
        print(b[-1])
from collections import deque

def solve():
    H, W = map(int, input().split())
    A = [list(input()) for _ in range(H)]
    INF = 10 ** 9
    d = [[INF] * W for i in range(H)]
    d[0][0] = 1 if A[0][0] == '#' else 0

    def bfs():
        prepare = 1 if A[0][0] == '#' else 0
        q = deque([(0, 0, prepare)])
        while q:
            w, h, c = q.popleft()
            for a, b in [(1,0), (0,1)]:
                w_n, h_n = w+a, h+b
                if w_n >= W or h_n >= H: continue
                k = 1 if A[w_n][h_n] == '#' else 0
                if c+k >= d[h_n][w_n]: continue
                d[h_n][w_n] = c+k
                q.append((w_n, h_n, c+k))
    bfs()
    return d[-1][-1]

print(solve())

### FIXED CODE ###

from collections import deque

def solve():
    H, W = map(int, input().split())
    A = [list(input()) for _ in range(H)]
    INF = 10 ** 9
    d = [[INF] * W for i in range(H)]
    d[0][0] = 1 if A[0][0] == '#' else 0

    prepare = 1 if A[0][0] == '#' else 0
    q = deque([(prepare, 0, 0)])
    while q:
        c, x, y = q.popleft()
        for a, b in [(1,0), (0,1)]:
            nx, ny = x+a, y+b
            if nx >= W or ny >= H: continue
            k = 1 if A[y][x] != A[ny][nx] else 0
            if c+k >= d[ny][nx]: continue
            d[ny][nx] = c+k
            q.append((c+k, nx, ny))

    return (d[H-1][W-1]+1)//2

print(solve())
# -*- coding: utf-8 -*-
l = [0] 
r = [0]
all_gate_clear = 1


#numcard
N = input()
card_count = range(N+1)
#gatenum
M = input()
#idカードの生成
for i in range(M):
    l_temp,r_temp = map(int, input().split())
l.append(l_temp)
r.append(r_temp)
    
for gate_num in range(1,M+1):
    #1ゲートの処理
    for card in range(1,N+1):
        num = 0
        while r[gate_num] >= l[gate_num] + num:
            if l[gate_num] + num == card:
                if card_count[card] == gate_num -1:
                    card_count[card] += 1
                    break
            num += 1

for card in range(1,N+1):
    if card_count[card] == M:
        all_gate_clear += 1

print(all_gate_clear)

### FIXED CODE ###

# -*- coding: utf-8 -*-
l = [] 
r = []
count = 0

N, M = map(int, input().split())
l = [0] * M
r = [0] * M
for i in range(0,M):
    l[i], r[i] = map(int, input().split())

#idカードの生成
    
ml = max(l)
mr = min(r)

for i in range(1,N+1):
    if  ml <= i and i <= mr:
        count += 1

print(count)
a=input()
b=abs(753-int(a[0]+a[1]+a[2]))
for i in range(int(len(a)-2)):
  if abs(753-int(a[i]+a[i+1]+a[i+2]))>abs(753-int(a[i+1]+a[i+2]+a[i+3])):
    b=abs(753-int(a[i+1]+a[i+2]+a[i+3]))
print(b)

### FIXED CODE ###

a=input()
b=753
for i in range(len(a)-2):
  if abs(int(a[i]+a[i+1]+a[i+2])-753)<b:
    b=abs(int(a[i]+a[i+1]+a[i+2])-753)
print(b)
from sys import stdin, stdout
n = int(stdin.readline())
nmleaves = list(map(int, stdin.readline().strip().split()))

if n == 0:
    print(0)
else:
    if nmleaves[0]!= 0:
        print(-1)
        exit()
    
    # pref[i]: sum(nmleaves[i:]), i.e., the number of leaves at or below level i.
    pref = [0]*(n+1)
    totsum = sum(nmleaves)
    pref[0] = totsum
    t = 0
    for i in range(1, n+1):
        t += nmleaves[i-1]
        pref[i]  = totsum - t

    prev_nl = 1
    ans = 1
    for lev in range(1, n+1):
        nodes = min(prev_nl*2, pref[lev])
        ans += nodes
        prev_nl = nodes - nmleaves[lev]
        if prev_nl < 0:
            print(-1)
            exit()
        elif prev_nl == 0 and pref[lev + 1]>0:
            print(-1)
            exit()
    print(ans)

### FIXED CODE ###

from sys import stdin, stdout
n = int(stdin.readline())
nmleaves = list(map(int, stdin.readline().strip().split()))

if nmleaves[0]:
   if n == 0 and nmleaves[0] == 1:
      print(1)
   else:
      print(-1)
   exit()

# pref[i]: sum(nmleaves[i:]), i.e., the number of leaves at or below level i.
pref = [0]*(n+1)
totsum = sum(nmleaves)
pref[0] = totsum
t = 0
for i in range(1, n+1):
    t += nmleaves[i-1]
    pref[i]  = totsum - t

prev_nl = 1
ans = 1
for lev in range(1, n+1):
    nodes = min(prev_nl*2, pref[lev])
    ans += nodes
    prev_nl = nodes - nmleaves[lev]
    if prev_nl < 0:
        print(-1)
        exit()
    elif prev_nl == 0 and lev+1<n+1 and pref[lev + 1]>0:
        print(-1)
        exit()
print(ans)
N = int(input())
A = int(input())
B = int(input())
if N==1:
	print("Hello world")
else:
	print(A+B)
  

### FIXED CODE ###


n = int(input())
if n==1:
	print("Hello World")
else:
	a = int(input())
	b = int(input())
	print(a+b)
s = input()
if s == "A" : s = "T"
else if s == "T" : s = "A"
else if s == "C" : s = "G"
else : s = "C"
print(s)

### FIXED CODE ###

s = input()
if s == "A" : s = "T"
elif s == "T" : s = "A"
elif s == "C" : s = "G"
else : s = "C"
print(s)
o = list(input())
e = list(input())
ans = ""

num = len(o) - len(e)
if num==0:
    for n in range(len(o)):
        ans += o[n] + e[n]
else:
    for n in range(len(o)):
        ans += o[n] + e[n]
    ans += e[len(o)-1]
print(ans)

### FIXED CODE ###

o = list(input())
e = list(input())
ans = ""

olen = len(o)
num = olen - len(e)
if num==0:
    for n in range(olen):
        ans += o[n] + e[n]
else:
    for n in range(len(e)):
        ans += o[n] + e[n]
    ans += o[olen-1]
print(ans)
N = int(input())

ans = 0

for(i = 1; i <= N; i++):
    ans +=1

print(i)

### FIXED CODE ###

N = int(input())

ans = 0

for i in range(1, N+1):
    ans +=i

print(ans)
h,w,k=map(int,input().split())
import numpy as np
l=[[0 for i in range(w+1)]]+[[0]+[int(j) for j in input()] for i in range(h)]
a=np.cumsum(l,axis=1)
a=np.cumsum(a,axis=0)
ans=h*w
def ink(h2,h1,w2,w1):
    return a[h2][w2]-a[h1][w2]-(a[h2][w1]-a[h1][w1])
for i in range(2**(h-1)):
    tl=[0]
    for j in range(h-1):
        if i>>j&1:
            tl.append(j+1)
    tl.append(h)
    t=len(tl)-2
    w1=0
    for w2 in range(1,w+1):
        for h1,h2 in zip(tl,tl[1:]):
            if ink(h2,h1,w2,w1)>k:
                w1=w2-1
                t+=1
                break
    ans=min(ans,t)
print(ans)

### FIXED CODE ###

h,w,k=map(int,input().split())
l=[[0 for i in range(w+1)]]+[[0]+[int(j) for j in input()] for i in range(h)]
a=[[0 for i in range(w+1)] for i in range(h+1)]
for i in range(1,h+1):
    for j in range(1,w+1):
        a[i][j]=a[i-1][j]+a[i][j-1]-a[i-1][j-1]+l[i][j]
ans=h*w
def ink(h2,h1,w2,w1):
    return a[h2][w2]-a[h1][w2]-(a[h2][w1]-a[h1][w1])
for i in range(2**(h-1)):
    tl=[0]
    for j in range(h-1):
        if i>>j&1:
            tl.append(j+1)
    tl.append(h)
    t=len(tl)-2
    w1=0
    for w2 in range(1,w+1):
        for h1,h2 in zip(tl,tl[1:]):
            if ink(h2,h1,w2,w1)>k:
                if w2-1==w1:
                    t=h*w
                    break
                w1=w2-1
                t+=1
                break
    ans=min(ans,t)
print(ans)
n,m= map(int,input().split())
l = list(map(int,input().split()))
s = sum(l)
r=s/(4*m)
cnt=0
for i in l:
    
    if i>=r:
        cnt=cnt+1

if cnt>=m:
    print("Yes")
else:
    print("No")
            

### FIXED CODE ###

a,b,c= map(int,input().split())
print(c,a,b)
N = str(input())

count = 0
yes = False

for i in range(N):
  a , b = map(int, input().split())
  
  if a==b:
    count +=1
    if count >= 3:
      print("Yes")
      yes = True
      break
  else:
    count = 0

if !yes:
  print("No")

### FIXED CODE ###

N = int(input())

count = 0
yes = False

for i in range(N):
  a , b = map(int, input().split())
  
  if a==b:
    count +=1
    if count >= 3:
      print("Yes")
      yes = True
      break
  else:
    count = 0

if not(yes):
  print("No")
import collections as c
N = int(input())
a = list(map(int,input().split()))
ue = a[0::2]
sita = a[1::2]
dictue = c.defaultdict(int)
dictsita = c.defaultdict(int)
for i in ue:
    dictue[i] += 1
for i in sita:
    dictsita[i] += 1
ue = list(dictue.items())
ue.sort(key=lambda x:x[1])
sita = list(dictsita.items())
sita.sort(key=lambda x:x[1])
m = ue[len(ue)-1]
n = sita[len(sita)-1]
if m[0] == n[0]:
    if len(ue) == 1:
        if len(sita) == 1:
            print(N//2)
        else:
            print(N-sita[len(sita)-2][1])
    else:
        if len(sita) == 1:
            print(N-ue[len(ue)-2])
        else:
            print(min(N-ue[len(ue)-2],N-sita[len(sita)-2]))
else:
    print(N-m[1]-n[1])

### FIXED CODE ###

import collections as c
N = int(input())
a = list(map(int,input().split()))
ue = a[0::2]
sita = a[1::2]
dictue = c.defaultdict(int)
dictsita = c.defaultdict(int)
for i in ue:
    dictue[i] += 1
for i in sita:
    dictsita[i] += 1
ue = list(dictue.items())
ue.sort(key=lambda x:x[1])
sita = list(dictsita.items())
sita.sort(key=lambda x:x[1])
m = ue[len(ue)-1]
n = sita[len(sita)-1]
if m[0] == n[0]:
    if len(ue) == 1:
        if len(sita) == 1:
            print(N//2)
        else:
            print(N-m[1]-sita[len(sita)-2][1])
    else:
        if len(sita) == 1:
            print(N-n[1]-ue[len(ue)-2][1])
        else:
            print(min(N-n[1]-ue[len(ue)-2][1],N-m[1]-sita[len(sita)-2][1]))
else:
    print(N-m[1]-n[1])
X = int(input())
number = X//100
teen = X%100

elif teen <= 5*number:
    print(1)
else:
    print(0)


### FIXED CODE ###

X = int(input())
number = X//100
teen = X%100

if teen <= 5*number:
    print(1)
else:
    print(0)
N, L = map(int, input().split())
inputs = [input() for _ in range(N)]

ans = [
    inputs[0] + inputs[1] + inputs[2],
    inputs[0] + inputs[2] + inputs[1],
    inputs[1] + inputs[0] + inputs[2],
    inputs[1] + inputs[2] + inputs[0],
    inputs[2] + inputs[0] + inputs[1],
    inputs[2] + inputs[1] + inputs[0],
]

print(min(ans))

### FIXED CODE ###

N, L = map(int, input().split())
inputs = [input() for _ in range(N)]

orderd_inputs = sorted(inputs)

print(''.join(orderd_inputs))
from __future__ import print_function
import sys


if sys.subversion[0] == "PyPy":
    import io, atexit

    sys.stdout = io.BytesIO()
    atexit.register(lambda: sys.__stdout__.write(sys.stdout.getvalue()))

    sys.stdin = io.BytesIO(sys.stdin.read())
    input = lambda: sys.stdin.readline().rstrip()
RS = raw_input
RA = lambda x=int: map(x, RS().split())
RN = lambda x=int: x(RS())


def solve():
    ans = 0
    for i in range(l, r+1):
        if i % d == 0:
            ans += 1
    print(ans)
    return





l, r, d = RA()
solve()


### FIXED CODE ###

from __future__ import print_function
import sys


if sys.subversion[0] == "PyPy":
    import io, atexit

    sys.stdout = io.BytesIO()
    atexit.register(lambda: sys.__stdout__.write(sys.stdout.getvalue()))

    sys.stdin = io.BytesIO(sys.stdin.read())
    input = lambda: sys.stdin.readline().rstrip()
RS = raw_input
RA = lambda x=int: map(x, RS().split())
RN = lambda x=int: x(RS())


def solve():
    ans = 0
    for i in range(l, r+1):
        if i % d == 0:
            ans += 1
    print(ans)
    return





l, r, d = RA()
solve()
import math
import collections

a, b = map(int, input().split())

gcd = math.gcd(a, b)


def prime_factorize(n):
    a = list()
    while n % 2 == 0:
        a.append(2)
        n //= 2
    f = 3
    while f * f <= n:
        if n % f == 0:
            a.append(f)
            n //= f
        else:
            f += 2
    if n != 1:
        a.append(n)
    return a


c = collections.Counter(prime_factorize(gcd))
print(len(c.keys()) + 1)






### FIXED CODE ###

from fractions import gcd
import collections

a, b = map(int, input().split())

gcd = gcd(a, b)


def prime_factorize(n):
    a = list()
    while n % 2 == 0:
        a.append(2)
        n //= 2
    f = 3
    while f * f <= n:
        if n % f == 0:
            a.append(f)
            n //= f
        else:
            f += 2
    if n != 1:
        a.append(n)
    return a


c = collections.Counter(prime_factorize(gcd))
print(len(c.keys()) + 1)
n,m,Q=map(int,input().split())

l=[]
r=[]
for i in range(m):
    a,b=map(int,input().split())
    l.append(a)
    r.append(b)

p=[]
q=[]    
for i in range(Q):
    c,d=map(int,input().split())
    p.append(c)
    q.append(d)

def ans(l,r,p,q):
    if p<=l and r<=q:
        return 1


for i in range(Q):
    answer=0
    for j in range(m):
        a=l[j]
        b=r[j]
        c=p[i]
        d=q[i]
        answer+=ans(a,b,c,d)  
    print(answer)

### FIXED CODE ###

n,m,Q=map(int,input().split())

l=[]
r=[]
for i in range(m):
    a,b=map(int,input().split())
    l.append(a)
    r.append(b)

p=[]
q=[]    
for i in range(Q):
    c,d=map(int,input().split())
    p.append(c)
    q.append(d)

grid=[[0]*(n+1) for i in range(n+1)]

for i in range(m):
    grid[l[i]][r[i]]+=1

for i in range(1,n+1):
    for j in range(1,n+1):
        grid[i][j]+=grid[i-1][j]
        grid[i][j]+=grid[i][j-1]
        grid[i][j]-=grid[i-1][j-1]
    
for i in range(Q):
    print(grid[q[i]][q[i]]-grid[q[i]][p[i]-1]-grid[p[i]-1][q[i]]+grid[p[i]-1][p[i]-1])
class Solution:
  def solve(self, D, T, S):
    time = D/S
    if time <= T:
      return True
    else:
      return False

A = Solution()
D,T,S = map(int, input().split())
print(A.solve(D,T,S)
    

### FIXED CODE ###

class Solution:
    def solve(self, D, T, S):
        time = D/S
        if time <= T:
            return 'Yes'
        else:
            return 'No'

if __name__ == '__main__':
    D, T, S = map(int, input().split())
    A = Solution()
    print(A.solve(D, T, S))
a,b,c,d,e,k=[int(input()) for i in range(5)]
print(e-a if e-a<=k else ":(")

### FIXED CODE ###

a,b,c,d,e,k=[int(input()) for i in range(6)]
print("Yay!" if e-a<=k else ":(")
a = input().split()

if a[0]*a[1]<=a[2]:
  return a[0]*a[1]

if a[0]*a[1]>a[2]:
  return a[2]



### FIXED CODE ###

a = [int(i) for i in input().split()]

if a[0]*a[1]<=a[2]:
  print(a[0]*a[1])
  
else:
  print(a[2])
N = input()
n =[int(x) for x in N]
A = n[0]
B = n[1]
C = n[2]
K = n[3]
if A>=K:
    print(K)
elif K <= A+B:
    print(A)
else:
    print(2*A+B-K)

### FIXED CODE ###

N = input()
n =[int(x) for x in N.split()]
A = n[0]
B = n[1]
C = n[2]
K = n[3]
if A>=K:
    print(K)
elif K <= A+B:
    print(A)
else:
    print(2*A+B-K)
# coding: utf-8
import sys
input = sys.stdin.readline

def f(v):
    if len(arc[v]) == 0:
        return(0)
    return(max(f(nv) for nv in arc[v]) + 1)

n, m = map(int, input().split()) # 2 <= n <= 10^5, 1 <= m <= 10^5
arc = [[] for _ in range(n + 1)]
for i in range(m):
    x, y = map(int, input().split())
    arc[x].append(y)
print(max(f(v + 1) for v in range(n)))


### FIXED CODE ###

# coding: utf-8
from functools import lru_cache

import sys
input = sys.stdin.readline
sys.setrecursionlimit(1000000)

@lru_cache(maxsize = None)
def f(v):
    if not arc[v]:
        return(0)
    return(max(f(nv) for nv in arc[v]) + 1)

n, m = map(int, input().split()) # 2 <= n <= 10^5, 1 <= m <= 10^5
arc = [[] for _ in range(n)]
for _ in range(m):
    x, y = map(int, input().split())
    arc[x - 1].append(y - 1)
print(max(f(v) for v in range(n)))
n=int(input())
if n==1:
    print("Hello World")
else:
    a,b=map(int,input().split())
    print(a+b)


### FIXED CODE ###

n=int(input())
if n==1:
    print("Hello World")
else:
    a=int(input())
    b=int(input())
    print(a+b)
import math
 
a,b = map(int,input().split())
 
def lcm(x,y):
    return x*y/(math.gcd(x,y)
 
print(int(lcm(a,b)))

### FIXED CODE ###

import fractions

a,b = map(int,input().split())

def lcm(x,y):
    z = int(x*y/fractions.gcd(x,y))
    return z
    
print(lcm(a,b))
A,B = input().split()

print(int(A)*round(float(b)*100)//100)

### FIXED CODE ###

a, b = map(str, open(0).read().split())
print(int(a)*int(b[:-3]+b[-2:]) // 100)
import sys
while 1:
    try:
        temp = input()
        if (temp==0):
            break
        N = temp
        a = []
        for i in range(N):
            a.append(map(int, raw_input().split())+[0])
        a.append([0 for i in range(0,temp+1)])	 
        for i in range(0,temp):#????????¢??????
            for j in range(0,temp):#????????¢??????
                a[i][temp] += a[i][j]
        for k in range(0,temp+1):#????????¢??????
            for l in range(0,temp):#????????¢??????
                a[temp][k] += a[l][k]
        for m in range(0,temp+1):
            for n in range(0,temp+1):
                sys.stdout.write(str(a[m][n]).rjust(5))
            print ""
    except(RuntimeError):
        pass

### FIXED CODE ###

import sys
try:
	while 1:
		temp = input()
		if (temp==0):
			break
		N = temp
		a = []
		for i in range(N):
			a.append(map(int, raw_input().split())+[0])
		a.append([0 for i in range(0,temp+1)])
		for i in range(0,temp):
			for j in range(0,temp):
				a[i][temp] += a[i][j]
		for k in range(0,temp+1):
			for l in range(0,temp):
				a[temp][k] += a[l][k]
		for m in range(0,temp+1):
			for n in range(0,temp+1):
				sys.stdout.write(str(a[m][n]).rjust(5))
			print ""
except(RuntimeError):
	pass
a,b = map(int,input().split())
if b = 100:
     print((100**a) * (b+1))
else:
    print((100**a) * (b))


### FIXED CODE ###

a,b = map(int,input().split())
if b == 100:
     print((100**a) * (b+1))
else:
    print((100**a) * (b))
# -*- coding: utf-8 -*-
a, b, c = map(int, input().split())
# 文字列の入力
s = input()
# 出力
print("{}".format(c-(a-b)))

### FIXED CODE ###

# -*- coding: utf-8 -*-
a, b, c = map(int, input().split())
# 文字列の入力
# 出力
print("{}".format(c-(a-b) if (c-(a-b)) > 0 else 0))
n = int(input())
A = list(map(int, input().split()))
q = int(input())
m = list(map(int, input().split()))

def solve(i, m):
  if m == 0:
    return True
  if i >= n :
    return False
  res = solve(i + 1, m) or solve(i + 1, m - a[i])
  return res

for tmp_m in m:
  if sum(a) < tmp_m:
    print('no')
  elif solve(0, tmp_m):
    print('yes')
  else:
    print('no')

### FIXED CODE ###

n = int(input())
A = list(map(int, input().split()))
q = int(input())
m = list(map(int, input().split()))

def solve(i, m):
  if m == 0:
    return True
  if i >= n :
    return False
  res = solve(i + 1, m) or solve(i + 1, m - A[i])
  return res

for tmp_m in m:
  if sum(A) < tmp_m:
    print('no')
  elif solve(0, tmp_m):
    print('yes')
  else:
    print('no')
a, b, c -= map(int, input().split())
if b-a == c-b:
     print("YES")
else:
     print("NO")

### FIXED CODE ###

a, b, c = map(int, input().split())
if b-a == c-b:
     print("YES")
else:
     print("NO")
from math import gcd

n=int(input())
a=list(map(int,input().split()))

l=[0]*(n)
for i in range(n-1):
    l[i+1] = gcd(l[i],a[i])

r=[0]*(n)
for i in range(n-2,-1,-1):
    r[i] = gcd(r[i+1],a[i+1])

print(max([gcd(r[i],l[i]) for i in range(n)]))

### FIXED CODE ###

from fractions import gcd

n=int(input())
a=list(map(int,input().split()))

l=[0]*(n)
for i in range(n-1):
    l[i+1] = gcd(l[i],a[i])

r=[0]*(n)
for i in range(n-2,-1,-1):
    r[i] = gcd(r[i+1],a[i+1])

print(max([gcd(r[i],l[i]) for i in range(n)]))
s = str(input())
 
alphabet = "abcdefghijklmnopqrstuvwxyz"

for i in range(len(alphabet)):
  if alphabet[i] in s:
  else:
    ans = alphabet[i]
    break
print(ans)

### FIXED CODE ###

s = str(input())
     
alphabet = "abcdefghijklmnopqrstuvwxyz"
     
ans ='None' 
for i in range(len(alphabet)):
        if not alphabet[i] in s:
                ans = alphabet[i]
                break
print(ans)
n = int(input())

a = input().split()

sum_a_rev = 0

for i in range(n):
    sum_a_rev = sum_a_rev + 1/int(a[i])

res = 1/sum_a_rev

print("{}".format(res))



### FIXED CODE ###

a = int(input())

s = input()

if a >= 3200:
    print("{}".format(s))
else:
    print("red")
N = int(input())
V = list(map(int, input().split()))
V.sorted()

ans = (V[0] + V[1]) / 2
for i in range(2, len(V) - 1)::
    ans = (ans + V[i]) / 2
print(ans)
  

### FIXED CODE ###

N = int(input())
V = list(map(int, input().split()))
V.sort()

ans = (V[0] + V[1]) / 2
for i in range(2, len(V)):
    ans = (ans + V[i]) / 2
print(ans)
import math

x1,y1,x2,y2 = input().split()

print(sqrt((x2-x1)^2 + (y2-y1)^2))

### FIXED CODE ###

import math

x1,y1,x2,y2 = map(float,input().split())

print(math.sqrt((x2-x1)**2 + (y2-y1)**2))
n = int(input())
m = {}
for i in n:
  s = input()
  if s in m:
    m[s] += 1
  else:
    m[s] = 1
    
maxim = max(m.values())
mySet = set(key if value == maxim for key, value in m.items())
for i in mySet:
  print(i)
  

### FIXED CODE ###

n = int(input())
m = {}
for i in range(n):
    s = input()
    if s in m:
        m[s] += 1
    else:
        m[s] = 1

maxim = max(m.values())
mySet = set(key for key, value in m.items() if value == maxim)
for i in sorted(mySet):
    print(i)
N, A,B = map(int, input().split())
str = []
from math import floor
list_ab = []
list_b = ['b']*A
list_ab.append(list_b)
list_a = ['a']*B
list_ab.append(list_a)

count = (floor(N/(A+B))+1)
str.append(list_ab*count)


import itertools
str = list(itertools.chain.from_iterable(str))
str = list(itertools.chain.from_iterable(str))

str = str[:N]
print(str.count('b'))


### FIXED CODE ###

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

count = N//(A+B)
if (N-count*(A+B))>A:
    print(count*A+A)
else:
    print(count*A+(N-count*(A+B)))
A,B,C,D  =map(int,input().split())
AB = [str(i) for i in range(A,B+1)]
CD = [str(j) for j in range(C,D+1)]
count = 0

for a in range(101):
  if str(a) in AB and str(a) in CD:
    count += 1
if count = 0:
  print(0)
else:
  print(count-1)

### FIXED CODE ###

A,B,C,D  =map(int,input().split())
AB = [str(i) for i in range(A,B+1)]
CD = [str(j) for j in range(C,D+1)]
count = 0

for a in range(101):
  if str(a) in AB and str(a) in CD:
    count += 1
if count == 0:
  print(0)
else:
  print(count-1)
n = int(input())
nums = list(map(int, input().split()))
ans = 1

if nums.count(0) > 0:
  ans = 0
else:
  for i in range(n):
    ans *= nums[i]
    if ans >= 10**18:
      ans = -1
      break
  else:
    break
 
print(ans)

### FIXED CODE ###

n = int(input())
nums = list(map(int, input().split()))
ans = 1

if nums.count(0) > 0:
  ans = 0
else:
  for i in range(n):
    ans *= nums[i]
    if ans > 10**18:
      ans = -1
      break

print(ans)
import math

N,X = map(int,input().split())
x = list(map(int,input().split()))
if N == 1:
    print(abs(x[0] - X))
else:
    xlen = []
    for i in range(N):
        xlen.append(x[i] - X)
    ans = xlen[0]
    for i in range(1,N):
        ans = math.gcd(ans,xlen[i])
    print(ans)

### FIXED CODE ###

def gcd(a,b) :
    if b>0 :
        return gcd(b,a % b)
    elif b == 0:
        return a


N,X = map(int,input().split())
x = list(map(int,input().split()))
if N == 1:
    print(abs(x[0] - X))
else:
    xlen = []
    for i in range(N):
        xlen.append(abs(x[i] - X))
        #print(xlen[i])
    ans = xlen[0]
    for i in range(1,N):
        ans = gcd(ans,xlen[i])
        #print(ans)
    print(ans)