Harryxun/stf_run huggingface dataset:
n = int(input())
h = [int (i) for i in input().split()]
ans=0

l=[]

if n==1:
	print("0")

else:
	for i in range(1,n):
		if h[i-1] >= h[i]:

			ans+=1

			if i==n-1:
				l.append(ans)

		else:

			l.append(ans)

			ans=0

print(max(l))

### FIXED CODE ###

n = int(input())
h = [int (i) for i in input().split()]
ans=0

l=[]

if n==1:
	l.append(ans)

else:
	for i in range(1,n):
		if h[i-1] >= h[i]:

			ans+=1

			if i==n-1:
				l.append(ans)

		else:

			l.append(ans)

			ans=0

print(max(l))
x=input().rstrip.split(" ")
z=[]
for i in range(2):
	for y in range(2):
      z.append(x[i-2]*x[y-2])
print(max(z))

### FIXED CODE ###

x=input().split(" ")
z=[]
for i in range(2):
	z.append(int(x[i-2])*int(x[0]))
for i in range(2):
    z.append(int(x[i-2])*int(x[1]))
print(max(z))
import numpy as np
class AdjDiGraph:
     def __init__(self,g):
          lines = g.split("\n")
          self.size = int(lines[0])+1 
          self.matrix = np.zeros((self.size, self.size)) # 指定された大きさで要素が0の行列を生成する
          for s in lines[1:]:
               d1,d2 = s.split(" ")
               self.connect(int(d1),int(d2))
          self.adjMatrix=np.dot(np.dot(self.matrix,self.matrix),self.matrix)
     def connect(self, x, y):
          self.connect1(x,y)            
     def connect1(self, x, y):
          self.matrix[x][y] = 1
     def connected(self,x,y):
          return self.matrix[x][y] == 1

     def traceByPower(self,start,end,rememberA=None,kaisu=None):
          if rememberA==None:
               c=self.adjMatrix
               rememberA=[self.adjMatrix]
               for i in range(2,self.size):
                    c=np.dot(c,self.adjMatrix)
                    rememberA.append(c)
        
          if kaisu==None:
               kaisu=0
               for A_i in rememberA:
                    kaisu+=1
                    if A_i[start][end]!=0:
                         return self.traceByPower(start,end,rememberA,kaisu)
          else:
               if kaisu==1:
                    return [start,end]
               else:
                    for i in range(1,kaisu):#startからi回でinterchange(中継地点)、interchangeからendをkaisu-i回で行く
                         for interchange in range(self.size):
                              if rememberA[i-1][start][interchange]!=0 and rememberA[kaisu-i-1][interchange][end]!=0:
                                   return self.traceByPower(start,interchange,rememberA,i)[:-1]+self.traceByPower(interchange,end,rememberA,kaisu-i)


n,m=map(int,input().split())
g=[str(n),"\n"]
for i in range(m):
     g.append(input())
     g.append("\n")
graph = AdjDiGraph("".join(g[:-1]))
s,t=map(int,input().split())
ans=graph.traceByPower(s,t)
if ans==None:
     print(-1)
else:
     print(len(ans)-1)

### FIXED CODE ###

import sys
input = sys.stdin.readline
 
def main():
     n,m=map(int,input().split())
     field=[[] for i in range(3*n)]
     for i in range(m):
          x,y=map(int,input().split())
          x,y=x-1,y-1
          field[3*x].append(3*y+1)
          field[3*x+1].append(3*y+2)
          field[3*x+2].append(3*y)
     
     s,t=map(int,input().split())
     s,t=s-1,t-1
     s,t=3*s,3*t
     
     d=[float('inf') for i in range(3*n)]
     d[s]=0
     
     que=[s]
     cnt=0
     while que!=[]:
          que2=[]
          cnt+=1
          for i in que:
               for j in field[i]:
                    if d[j]>cnt:
                         d[j]=cnt
                         que2.append(j)
          que=que2
     if d[t]==float('inf'):
          print(-1)
     else:
          print(d[t]//3)
     return 
 
if __name__ == '__main__':
    main()
# @Author: Amit Dwivedi
# @Date:   2019-12-22 11:55:43
# @Last Modified by:   Amit Dwivedi
# @Last Modified time: 2019-12-22 12:04:16
ll= lambda : list(map(int,input().split()))
testcases=1
# testcases=int(input())
for testcase in range(testcases):
	[n] = ll()
	s,t = input().split()
	for i in range(n):
		print(s[i],t[i],sep = "",end = 

### FIXED CODE ###

# @Author: Amit Dwivedi
# @Date:   2019-12-22 11:55:43
# @Last Modified by:   Amit Dwivedi
# @Last Modified time: 2019-12-22 12:04:16
ll= lambda : list(map(int,input().split()))
testcases=1
# testcases=int(input())
for testcase in range(testcases):
	[n] = ll()
	s,t = input().split()
	for i in range(n):
		print(s[i],t[i],sep = "",end = "")
import fractions

N = int(input())
inp_ints = list(map(int, input().split()))
ints = list(set(inp_ints))
""" uniq_ints = list(set(inp_ints))

ints = uniq_ints
for m in uniq_ints:
    if inp_ints.count(m) >= 2:
        ints.append(m) """

gcd = 0
result = 1
holed_ints = []
for i in range(N):
    holed_ints = ints[:i] + ints[i+1:]
    gcd = 0
    for j in range(N-1):
        gcd = fractions.gcd(gcd, holed_ints[j])
    if gcd > result:
        result = gcd

print(result)

### FIXED CODE ###

import fractions

integral_count = int(input())
blackboard_integers = list(map(int, input().split()))

gcd_integers = list(set(blackboard_integers))

gcd = 0
result = 1
for i in range(len(gcd_integers)):
    gcd = 0
    if blackboard_integers.count(gcd_integers[i]) >= 2:
        for n in gcd_integers:
            gcd = fractions.gcd(gcd, n)
    else:
        for n in gcd_integers[:i]:
            gcd = fractions.gcd(gcd, n)
        for n in gcd_integers[i+1:]:
            gcd = fractions.gcd(gcd, n)
    if gcd > result:
        result = gcd

print(result)
N,X,M = map(int,input().split())

List = [X]

for i in range(N-1):
    X = X**2 % M
    if X in List:
        #配列の何番目か
        num = i + 1
        #同じ数字
        key = List.index(X)
        break
    List.append(X)

ans = sum(List)

loop = (N - len(List)) // (num - key)
add = (N - len(List)) % (num - key)

ans += loop * sum(List[key:num])
ans += sum(List[key:key+add])
print(loop,key,num)
print(ans)

### FIXED CODE ###

N,X,M = map(int,input().split())

List = [X]

for i in range(N-1):
    X = X**2 % M
    if X in List:
        #配列の何番目か
        num = i + 1
        #同じ数字
        key = List.index(X)
        break
    List.append(X)

ans = sum(List)
if len(List) == N:
    print(ans)

else:
    loop = (N - len(List)) // (num - key)
    add = (N - len(List)) % (num - key)

    ans += (N - len(List)) // (num - key) * sum(List[key:num])
    ans += sum(List[key:key+((N - len(List)) % (num - key))])

    print(ans)
import math
N = int(input())
cnt = 0
for i in range(1,int(math.sqrt(N))+1):
	if N % i == 0:		
		if N / i == i:
			cnt += i-1
		else:
			cnt += N/i-1
print(int(cnt))

### FIXED CODE ###

N,K = map(int,input().split())
print(N-K+1)
a, b = map(int, input().split())
if (a*b) % 2:
    print("Odd")
else:
    print("Even")

### FIXED CODE ###

print(input().count('1'))
n=int(input())
s=input()
a=0
if n>2:
    for i in range(0,n):
        if s[i]=='A' and s[i+1]=='B' and s[i+2]=='C' and i<n-1:
         a=a+1
print(a)

### FIXED CODE ###

n=int(input())
s=input()
a=0
if n>2:
    for i in range(0,n):
        if i<n-2 and s[i]=='A' and s[i+1]=='B' and s[i+2]=='C':
         a=a+1
print(a)
s,t=input()
ans=0
if s[0] == t[0]:
    ans+=1
if s[1] == t[1]:
    ans+=1
if s[2] == t[2]:
    ans+=1
print(ans)

### FIXED CODE ###

s=input()
t=input()
ans=0
if s[0] == t[0]:
    ans+=1
if s[1] == t[1]:
    ans+=1
if s[2] == t[2]:
    ans+=1
print(ans)
S=input()
if S[3] == S[4]:
    if S[5] == S[6]:
        print("Yes")
    else:
        print("No")
else:
    print("No")    


### FIXED CODE ###

S=input()
if S[2] == S[3]:
    if S[4] == S[5]:
        print("Yes")
    else:
        print("No")
else:
    print("No")
import numpy as np
from scipy.sparse.csgraph import shortest_path
N, M, K = tuple(map(int, input().split()))
friends = [list(map(int, input().split())) for _ in range(M)]
blocks = [list(map(int, input().split())) for _ in range(K)]

friend_matrix = np.zeros((N, N))

for friend in friends:
	friend_matrix[friend[0]-1, friend[1]-1] = 1
	friend_matrix[friend[1]-1, friend[0]-1] = 1

# matrix for direct friendship between 2
# print('friend_matrix')
# print(friend_matrix)

# matrix for friendship distance
friend_distance = shortest_path(friend_matrix)
# print('friend_distance')
# print(friend_distance)

def is_friend_candidate(a, b):
	if a == b:
		return False
	for block in blocks:
		if block == [a, b] or block == [b, a]:
			return False
	for friend in friends:
		if friend == [a, b] or friend == [b, a]:
			return False
	if friend_distance[a-1, b-1] == np.inf:
		return False
	return True

candidate_matrix = np.zeros((N, N))
for i in range(N):
	for other in range(N):
		if candidate_matrix[i, other] == 1:
			continue
		if is_friend_candidate(i+1, other+1):
			candidate_matrix[i, other] = 1
			candidate_matrix[other, i] = 1

# matrix for friendship candidate
# print('candidate_matrix')
# print(candidate_matrix)

# atcoder numpy is outdated
# print(np.__version__)
# candidate_counts = np.count_nonzero(candidate_matrix == 1, axis=0)
candidate_counts = []
for row in candidate_matrix:
	candidate_counts.append(np.count_nonzero(row == 1))

# print('candidate_counts')
# print(candidate_counts)
print(' '.join(map(str, candidate_counts)))
	


### FIXED CODE ###

N = int(input())
if N % 2 == 1:
	n = N + 1
else:
	n = N
print(int(n / 2))
S=input()
T=input()
cout=0
for i in len(S):
  if S[i]!=T[i]:
    cout=cout+1
print (cout)

### FIXED CODE ###

S=input()
T=input()
cout=0
for i in range(len(S)):
    if S[i]!=T[i]:
        cout=cout+1
print (cout)
#!/usr/bin/env python3
import sys
# from fractions import gcd
from math import gcd
from functools import reduce

def lcm(x, y):
    return (x * y) // gcd(x, y)


def solve(N: int, T: "List[int]"):
    print(reduce(lcm, T))
    return


# Generated by 1.1.5 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    T = [int(next(tokens)) for _ in range(N)]  # type: "List[int]"
    solve(N, T)

if __name__ == '__main__':
    main()


### FIXED CODE ###

#!/usr/bin/env python3
import sys
from fractions import gcd
# from math import gcd
from functools import reduce

def lcm(x, y):
    return (x * y) // gcd(x, y)


def solve(N: int, T: "List[int]"):
    print(reduce(lcm, T))
    return


# Generated by 1.1.5 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    T = [int(next(tokens)) for _ in range(N)]  # type: "List[int]"
    solve(N, T)

if __name__ == '__main__':
    main()
a,b,x=map(int,input().split())
if a == 0:
    print(b//x)+1
else:
    print(b//x-(a-1)//x)


### FIXED CODE ###

a,b,x=map(int,input().split())
print((b//x)-((a-1)//x))
N = int(input())
a = 1
L = list(map(int, input().split()))
for i in L:
    a *= i
    if(a > 1e18)break

print(-1 if a > 1e18 else a)


### FIXED CODE ###

N = int(input())
a = 1
L = list(map(int, input().split()))
L.sort()
for i in L:
    a *= i
    if (a > 1e18):
        break

print(-1 if a > 1e18 else a)
from math import gcd
key = int(input())
sin = 0
for i in range(1,k+1):
    for j in range(1,k+1):
        tmp = gcd(i,j)
        for m in range(1,k+1):
            sin += gcd(m,tmp)
print(sin)

### FIXED CODE ###

from math import gcd
key = int(input())
sin = 0
for i in range(1,key+1):
    for j in range(1,key+1):
        temp = gcd(i,j)
        for m in range(1,key+1):
            sin += gcd(m,temp)
print(sin)
import sys
input = sys.stdin.readline

N,Q = list(map(int,input().split()))

road = []
x_list = []
for i in range(N):
    s,t,x = list(map(int,input().split()))
    road.append((s-x,x,0))
    road.append((t-x,x,1))
    x_list.append(x)

for i in range(Q):
    d = int(input())
    road.append((d,i,2))

road.sort(lambda x:x[2])
road.sort(lambda x:x[0])

x_list = list(set(x_list))
x_list.sort()

x2i_dict = {}
for i,x in enumerate(x_list):
    x2i_dict[x]=i


class BIT:
            
    def __init__(self, L):
        self.N = len(L)
        self.bit = [0]*self.N
        for i,l in enumerate(L):
            self.add(i,l)

    def add(self, a, w):
        x = a + 1
        for i in range(1000):
            self.bit[x-1] += w
            x += x & -x
            if x > self.N:
                break

    def sum(self, a):
        x = a+1
        ret = 0
        for i in range(1000):
            ret += self.bit[x-1]
            x -= x & -x
            if x <= 0:
                break        
        return ret


bit = BIT([0]*xn)

def bisectR(l,r,bit):
    while r-l>1:
        if bit.sum((l+r)//2)>0:
            r = (l+r)//2
        else:
            l = (l+r)//2
    return r

xn=len(x_list)

ans = [0]*Q
for r in road:
    if r[2]==0:
        bit.add(x2i_dict[r[1]],1)
    elif r[2]==1:
        bit.add(x2i_dict[r[1]],-1)
    else:
        if bit.sum(xn-1)==0:
            ans[r[1]]=-1
        elif bit.sum(0)>0:
            ans[r[1]]=x_list[0]
        else:
            i = bisectR(0,xn-1)
            ans[r[1]] = x_list[r]
for a in ans:
    print(a)

### FIXED CODE ###

import sys

sys.setrecursionlimit(500000)
def input():
    return sys.stdin.readline()[:-1]

def main():
    N,Q = list(map(int,input().split()))

    road = []
    x_list = []

    for i in range(N):
        s,t,x = list(map(int,input().split()))
        road.append([0,s-x,x])
        road.append([1,t-x,x])

    for i in range(Q):
        road.append([2,int(input()),i])

    from collections import defaultdict

    counter = defaultdict(int)
    counter[10**27] = 1
    ans = [0]*Q

    road.sort(key=lambda x:x[0])
    road.sort(key=lambda x:x[1])

    q = [10**27]

    from heapq import heappop,heappush

    for id,_,x in road:
        if id==0:
            heappush(q,x)
            counter[x]+=1
        elif id==1:
            counter[x]-=1
        else:
            while counter[q[0]]==0:
                heappop(q)
            #print(q)
            if q[0]<10**27:
                ans[x] = q[0]
            else:
                ans[x] = -1
    print("\n".join(map(str,ans)))

if __name__ == '__main__':
    main()
import math
def solution():
    a, b, h, m = [int(input()) for i in range(4)]
    return pow(a**a + b*b -2*a*b*math.cos(2*math.pi*(h/12 - m/60)))

print(solution())

### FIXED CODE ###

from math import *
def solution():
    a, b, h, m  = map(int, input().split())
    return (a*a+b*b-2*a*b*cos((m*11/360-h/6)*pi))**.5
print(solution())
n = int(input())
p = [int(s) for s in input().split()]
count = 0
m = p[0]
for a in range(n):
     i = p[a]
     if M>=i:
         count+=1
         m = i
        
print(count)

### FIXED CODE ###

n = int(input())
p = [int(s) for s in input().split()]
count = 0
M = p[0]
for a in range(n):
     i = p[a]
     if M >=i :
          count+=1
          M = i
print(count)
from decimal import *

getcontext().prec = 20

N = int(input())
A = [int(Decimal(input())*(10**9)) for _ in [0]*N]

cnt = [[0]*20 for _ in [0]*20]
B = [None]*N
for k,a in enumerate(A):
    i = 0
    j = 0
    while a%2==0:
        a//=2
        i+=1
    while a%5==0:
        a//=5
        j+=1
    B[k] = (i,j)
    cnt[i][j] += 1

for i in range(1,20):
    i = 19-i
    for j in range(20):
        j = 19-j
        cnt[i][j] += cnt[i+1][j]

for i in range(20):
    i = 19-i
    for j in range(1,20):
        j = 19-j
        cnt[i][j] += cnt[i][j+1]

ans = 0
for i,j in B:
    me = int(i>=9 and j>=9)
    print(i,j,cnt[18-i][18-j]-me)
    ans += cnt[18-i][18-j]-me

print(ans//2)

### FIXED CODE ###

N = int(input())
A = [input() for _ in [0]*N]

for i,a in enumerate(A):
    b = a.split(".")
    if len(b)==1:
        A[i] = int(a)*10**9
        continue
    c = b[1]
    n = len(c)
    c += "0"*(9-n)
    A[i] = int(b[0] + c)

cnt = [[0]*40 for _ in [0]*40]
B = [(0,0)]*N
for k,a in enumerate(A):
    i = 0
    j = 0
    while a%2==0:
        a//=2
        i+=1
    while a%5==0:
        a//=5
        j+=1
    B[k] = (i,j)
    cnt[i][j] += 1

for i in range(1,40):
    i = 39-i
    for j in range(40):
        j = 39-j
        cnt[i][j] += cnt[i+1][j]

for i in range(40):
    i = 39-i
    for j in range(1,40):
        j = 39-j
        cnt[i][j] += cnt[i][j+1]

ans = 0
for i,j in B:
    me = int(i>=9 and j>=9)
    ans += cnt[max(0,18-i)][max(0,18-j)]-me

print(ans//2)
n=int(input())
l=list(map(int(input())))

ans=0
s=sum(l)

for i in range(n):

    ans+=l[i]*(s-l[i])

print(ans/2)

### FIXED CODE ###

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

ans=0
s=sum(l)

for i in range(n):

    ans+=l[i]*(s-l[i])

print(int(ans/2))
import sys
def amida(A,x):
  for e in A:
    if e[x]==1:x+=1
    elif e[x-1]==1:x-=1
  return x
def f():
  for i in range(d):
    for j in range(1,n):
      if A[i][j]==0:
        B=[e[:] for e in A]
        B[i][j]=1
        if amida(B,m)==p:
          print i+1,j
          return
  print 1
  return

n=input()
m=input()
p=input()
d=input()
A=[]
for s in sys.stdin:
  if s=="0\n":break
  A+=[[0]+map(int,list(s[:-1]))+[0]]
if amida(A,m)==p: print 0
else:f()

### FIXED CODE ###

import sys
def amida(A,x):
  for e in A:
    if e[x]=="1":x+=1
    elif e[x-1]=="1":x-=1
  return x
def f():
  for i in D:
    for j in range(1,n):
      if A[i][j-1:j+2]=="000":
        B=[e[:] for e in A]
        B[i]=B[i][:j]+"1"+B[i][j+1:]
        if amida(B,m)==p:
          print i+1,j
          return
  print 1
  return

while 1:
  n=input()
  if n==0:break
  m=input()
  p=input()
  D=range(input())
  A=["0"+raw_input()+"0" for i in D]
  if amida(A,m)==p:print 0
  else:f()
from fractions import gcd
h,w,a,b=map(int,input().split())
if a*w!=b*h:
    if h==1 and b==0:
        print("1"*a+"0"*(w-a))
    elif w==1 and a==0:
        for i in range(h):
            if i<b:
                print(1)
            else:
                print(0)
    else:
        print("No")
else:
    t=gcd(a,b)
    s="1"*(a)+"0"*(h-a)
    for i in range(w):
        print(s)
        if (i+1)%(b//t)==0:
            s=s[-(a//t):]+s[:-(a//t)]

### FIXED CODE ###

h,w,a,b=map(int,input().split())
for i in range(h):
    if i<b:
        print("0"*a+"1"*(w-a))
    else:
        print("1"*a+"0"*(w-a))
ns=list(map(int,input().split())
ns.sort()
print(ns[2]*10+ns[1]+ns[0])

### FIXED CODE ###

ns=list(map(int,input().split()))
ns.sort()
print(ns[2]*10+ns[1]+ns[0])
W, H, N = map(int, input().split())
lst = [list(map(int, input().split())) for _ in range(N)]

X = [0, W]
Y = [0, H]

for l in lst:
    if l[2] == 1 and X[0] < l[0]:
        X[0] = l[0]
    elif l[2] == 2 and l[0] < X[1]:
        X[1] = l[0]
    elif l[2] == 3 and Y[0] < l[1]:
        Y[0] = l[1]
    elif lst[2] == 4 and l[1] < Y[1]:
        Y[1] = l[1]

width = X[1] - X[0]
height = Y[1] - Y[0]

if width > 0 and height > 0:
    print(width * height)
else:
    print(0)

### FIXED CODE ###

W, H, N = map(int, input().split())
lst = [list(map(int, input().split())) for _ in range(N)]

W_ = [0, W] 
H_ = [0, H]

for l in lst:
    if l[2] == 1 and W_[0] < l[0]:
        W_[0] = l[0]
    elif l[2] == 2 and l[0] < W_[1]:
        W_[1] = l[0]
    elif l[2] == 3 and H_[0] < l[1]:
        H_[0] = l[1]
    elif l[2] == 4 and l[1] < H_[1]:
        H_[1] = l[1]
        
width = W_[1] - W_[0] if W_[1] - W_[0] > 0 else 0
height = H_[1] - H_[0] if H_[1] - H_[0] > 0 else 0

print(width * height)
from math import gcd
# from fractions import gcd
from itertools import combinations

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

l = set(gcd(x, y) for x, y in list(combinations(a, 2)))
if 1 in l:
    remove(1)
print(max(l))

### FIXED CODE ###

from fractions import gcd
from itertools import accumulate

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

b = list(accumulate([0] + a, gcd))
c = list(accumulate([0] + a[::-1], gcd))
l = list(gcd(s, t) for s, t in zip(b[:-1], c[::-1][1:]))
print(max(l))
import sys
import bisect

def main():
    input = sys.stdin.buffer.readline
    N = int(input())
    A = list(map(int, input().split()))
    A.sort()
    B = list(map(int, input().split()))
    B.sort()
    C = list(map(int, input().split()))
    ans = 0
    for i in B:
        a = bisect.bisect_left(A, b)
        c = bisect.bisect_right(C, b)
        ans += a*(N-c)
    print(sum(A_count))

if __name__ == '__main__':
    main()

### FIXED CODE ###

import sys
import bisect

def main():
    input = sys.stdin.buffer.readline
    N = int(input())
    A = list(map(int, input().split()))
    A.sort()
    B = list(map(int, input().split()))
    B.sort()
    C = list(map(int, input().split()))
    C.sort()
    ans = 0
    for i in B:
        a = bisect.bisect_left(A, i)
        c = bisect.bisect_right(C, i)
        ans += a*(N-c)
    print(ans)

if __name__ == '__main__':
    main()
def func(x):

    if len(x) == 0:
        return True
    elif len(x) < 5:
        return False
    else:
        if x[-5:] == "dream":
            return func(x[:-5])
        elif x[-7:] == "dreamer":
            return func(x[:-7])
        elif x[-5:] == "erase":
            return func(x[:-5])
        elif x[-6:] == "eraser":
            return func(x[:-6])
        else:
            return False

def solve(n):

    ans = func(n)
    return "YES" if ans else "NO"

if __name__ == "__main__":
    n = input()
    print(solve(n))


### FIXED CODE ###

def solve(n):

    while len(n) > 4:
        if n[-5:] == "dream":
            n = n[:-5]
        elif n[-7:] == "dreamer":
            n = n[:-7]
        elif n[-5:] == "erase":
            n = n[:-5]
        elif n[-6:] == "eraser":
            n = n[:-6]
        else:
            break

    return "YES" if len(n) == 0 else "NO"

if __name__ == "__main__":
    n = input()
    print(solve(n))
import sys
N, M = map(int, input().split())

a_list = [0] * M

for m in range(M):
    a_list[m] = int(input())

for m in range(M - 1):
    if a_list[m] + 1 == a_list[m + 1]:
        print(0)
        sys.exit()

range_list = [i for i in range(1, N + 1)]
new_list = [0] * (M + 1)

a = 0
if a_list[0] == 1:
    new_list[0] = []
else:
    new_list[0] = [0] + range_list[0: a_list[0] - 1]
new_list[M] = range_list[a_list[M - 1]:]

if M - 1 >= 1:
    for m in range(1, M):
        new_list[m] = range_list[a_list[m - 1]: a_list[m] - 1]

MOD = 1000000007
#print(new_list)
value = 1
for item in new_list:
    if len(item) == 0:
        continue
    else:
        if (len(item) - 1) % 2 == 0:
            value *= (2 ** ((len(item) - 1) // 2)) % MOD
            value %= MOD
        else:
            value *= ((2 ** ((len(item) - 1) // 2)) + 2 ** (((len(item) - 1) // 2) - 1)) % MOD
            value %= MOD

print(value)

### FIXED CODE ###

import sys
N, M = map(int, input().split())

MOD = 1000000007

def fib(n):
    dp_list = [0] * n
    dp_list[0] = 1
    if n == 1:
        return 1
    dp_list[1] = 2
    
    for i in range(2, n):
        dp_list[i] = dp_list[i - 1] + dp_list[i - 2]
    return dp_list[n - 1]

if M == 0:
    print(fib(N) % MOD)
    sys.exit()

a_list = [0] * M

for m in range(M):
    a_list[m] = int(input())

for m in range(M - 1):
    if a_list[m] + 1 == a_list[m + 1]:
        print(0)
        sys.exit()
    else:
        continue

range_list = [i for i in range(1, N + 1)]
new_list = [0] * (M + 1)


new_list[0] = [0] + range_list[0: a_list[0] - 1]
new_list[M] = range_list[a_list[M - 1]:]

if M - 1 >= 1:
    for m in range(1, M):
        new_list[m] = range_list[a_list[m - 1]: a_list[m] - 1]

count = 1
for item in new_list:
    if not item or len(item) == 1:
        continue
    else:
        count *= (fib(len(item) - 1) % MOD)
        count %= MOD
        #print(count)
print(count)