qyliang/CodeNanoFix huggingface dataset:
Buggy code:
#Can you get AC?
S = input()
p = 0
for i in range(n-1):
    if S[i:i+2] == "AC":
        print("Yes")
        p = p + 1
        break
    else:
        continue
if p == 0:
    print("No")

Fixed code:
#Can you get AC?
S = input()
n = len(S)
p = 0
for i in range(n-1):
    if S[i:i+2] == "AC":
        print("Yes")
        p = p + 1
        break
    else:
        continue
if p == 0:
    print("No")
Buggy code:
s = input()

flag = True

for i in range(len(s)-1):
  if s[i] == 'A' and s[i+1] == 'C':
    print("Yes")
    flag = False
    
if flag:
  print("No")
    


Fixed code:
s = input()

flag = True

for i in range(len(s)-1):
  if s[i] == 'A' and s[i+1] == 'C':
    if flag:
      print("Yes")
    flag = False
    
if flag:
  print("No")
Buggy code:
s=input()
for i in range(0,len(s)-1):
    if s[i]=="A" and s[i+1]=="C":
        print("Yes")
        exit()
    else:
        print("No")

Fixed code:
s=input()
for i in range(0,len(s)-1):
    if s[i]=="A" and s[i+1]=="C":
        print("Yes")
        exit()

print("No")
Buggy code:
s=input()
b=True
for i in range(0,len(s)-1):
    if s[i:i+2]=='AC':
        print('Yes')
        b=False
if b==True:print('No')

Fixed code:
s=input()
b=True
for i in range(0,len(s)-1):
    if s[i:i+2]=='AC':
        print('Yes')
        b=False
        break
if b==True:print('No')
Buggy code:
S = input()
if S.count("AC") == 1:
  print("Yes")
else:
  print("No")

Fixed code:
S = input()
if S.count("AC") >= 1:
  print("Yes")
else:
  print("No")
Buggy code:
def solve():
	S = input()
	for i in range(len(S)-1):
		if S[i:i+2]=='AC':
			print('Yes')
			return
	print('No')
	return

 solve()

Fixed code:
def solve():
	S = input()
	for i in range(len(S)-1):
		if S[i:i+2]=='AC':
			print('Yes')
			return
	print('No')
	return

solve()
Buggy code:
s= input()
t=0
for i in range(len(s)-1):
  if s[i:i+1]=="AC":
    t +=1
if t>0:
  print("Yes")
else:
  print("No")


Fixed code:
s= input()
t=0
for i in range(len(s)-1):
  if s[i]+s[i+1]=="AC":
    t +=1
if t>0:
  print("Yes")
else:
  print("No")
Buggy code:
s=input()
flag=False
for i in range(len(s)-1):
  if s[i:i+1]=='AC':
    flag=True
if flag:
  print('Yes')
else:
  print('No')

Fixed code:
s=input()
flag=False
for i in range(len(s)-1):
  if s[i:i+2]=='AC':
    flag=True
if flag:
  print('Yes')
else:
  print('No')
Buggy code:
S = input()
flag = False

for i in range(4):
    if S[i:i+2] == "AC"
        flag = True

print("Yes" if flag else "No")

Fixed code:
S = input()
flag = False

for i in range(4):
    if S[i:i+2] == "AC":
        flag = True

print("Yes" if flag else "No")
Buggy code:
S = input()
for i in range(len(S)-1):
  if S[i]+S[i] == "AC":
    print("Yes")
    break
print("No")

Fixed code:
S = input()
for i in range(len(S)-1):
  if S[i:i+2]=="AC":
    print("Yes")
    break
else:
  print("No")
Buggy code:
s = input()

for i in range(len(s)-1):
if s[i] == "A" and s[i+1] == "C":
    print("Yes")
else:
    print("No")
    
 
    
 
    

Fixed code:
s = input()
for i in range(len(s)-1):
  if s[i]=="A" and s[i+1]=="C":
    print("Yes")
    exit()
print("No")
Buggy code:
s = int(input())
l = []
for i in range(len(s)-1):
  l.append(s[i:i+2])
print("Yes" if "AC" in l else "No") 

Fixed code:
s = input()
l = []
for i in range(len(s)-1):
  l.append(s[i:i+2])
print("Yes" if "AC" in l else "No")
Buggy code:
print('YNeos'['AC'in input()::2]

Fixed code:
print(' YNeos'['AC' in input()::2])
Buggy code:
S = input()
for i in range(len(S) - 1):
    if S[i, i + 1] == "AC":
        print("Yes")
        exit()
print("No")


Fixed code:
S = input()
for i in range(len(S)-1):
    if S[i:i+2] == "AC":
        print("Yes")
        exit()
print("No")
Buggy code:
s = input()
ans = "No"
for i in range(len(s)-1):
  if s[i] == "A" and s[i+1] == "C":
    ans = "Yes"
 	break
print(ans)

Fixed code:
s = input()

for i in range(len(s)-1):
    if s[i] == "A" and s[i+1] == "C":
        print("Yes")
        break
else:
    print("No")
Buggy code:
S=input()

for i in range(len(S)-1):
  if S[i]=='A' and S[i+1]=='C':
    print('Yes')
  else:
    print('No')

Fixed code:
S=str(input())
for i in range(len(S)-1):
  if S[i]=="A" and S[i+1]=="C":
    print("Yes")
    break
else: print("No")
Buggy code:
x=input()
y='AC'


if x in y==True:
    print('Yes')
else:
    print('No')



Fixed code:
x=input()
y='AC'


if (y in x) ==True:
    print('Yes')
else:
    print('No')
Buggy code:
print(["Yes", "No"]["AC" in input()])


Fixed code:
print(["No","Yes"]["AC"in input()])
Buggy code:
print("Yes" if any([input()[i:i + 2] == "AC" for i in range(len(input()) - 1)]) else "No")

Fixed code:
data = input()
print("Yes" if "AC" in [data[i:i+2] for i in range(len(data)-1)] else "No")
Buggy code:
S = input()
f = True
for i in range( len(S)-1 ):
    if S[i] == 'A' and S[i+1] == 'C':
        print('Yes')
        f = False

if f:
    print('No')


Fixed code:
S=input()
f=True
for i in range( len(S)-1 ):
    if S[i] == 'A' and S[i+1] == 'C':
        f = False
        

if f:
    print('No')
else:
    print('Yes')
Buggy code:
a = input()
if 'AC' in s:
  print('Yes')
else:
  print('No')

Fixed code:
a = input()
if 'AC' in a:
	print('Yes')
else:
	print('No')
Buggy code:
a=input("");
flag=False;
for i in xrange(0,len(a)-2):
  if a[i]=='A' and a[i+1]=='C':
    flag=True;
if flag==True:
  print("Yes");
else:
  print("No");


Fixed code:
a=input("");
flag=False;
for i in range(0,len(a)-1):
  if a[i]=='A' and a[i+1]=='C':
    flag=True;
if flag==True:
  print("Yes");
else:
  print("No");
Buggy code:
S = str(input())
Slist = list(S)
flag = False
for i in range(len(Slist)-1):
    st = Slist[i] + Slist[i+1]
    if(st == "AC" and flag == False):
        prinSSFGt('Yes')
        flag = True
if(flag == False):
    print('No')
        

Fixed code:
S = str(input())
Slist = list(S)
flag = False
for i in range(len(Slist)-1):
    st = Slist[i] + Slist[i+1]
    if(st == "AC" and flag == False):
        print('Yes')
        flag = True
if(flag == False):
    print('No')
Buggy code:
inputs = input()

inputs = list(inputs)

flag = False
for i in range(len(inputs) - 1):
    if inputs[i] == 'A' and inputs[i+1] == 'C'
        flag = True
        
if flag:
    print('Yes')
else:
    print('No')

Fixed code:
inputs = input()

x = list(inputs)

flag = False
for i in range(len(x) - 1):
    if x[i] == 'A' and x[i+1] == 'C':
        flag = True

if flag:
    print('Yes')
else:
    print('No')
Buggy code:
#! usr/bin/env python3

# A :

S = input()

if "AC" in S:
	print("Yes")

else:

Fixed code:
#! usr/bin/env python3

# A :

S = input()

if "AC" in S:
	print("Yes")

else:
	print("No")
Buggy code:
s = input()
ans = "No"
for i in range(len(s)-1):
  if s[i:i+2] == "AC":
    print("Yes")
print(ans)

Fixed code:
s = list(input())
ans = 'No'
for i in range(len(s) - 1):
    if s[i: i + 2] == list('AC'):
        ans = 'Yes'
        break
print(ans)
Buggy code:
s = input()
ans = "No"
for i in range(len(s)-1):
  if s[i:i+1] == "AC":
    print("Yes")
print(ans)

Fixed code:
s = input()
ans = "No"
for i in range(0,len(s)-1):
    if s[i]+s[i+1] == "AC":
        ans = "Yes"
print(ans)
Buggy code:
s = input()

for i in range(len(s)-1)
if s[i][i+1] == "AC":
    print("Yes")
else:
    print("No")
    
 
    

Fixed code:
s = input()
for i in range(len(s)-1):
    if s[i:i+2] == "AC":
        print("Yes")
        break
else:
    print("No")
Buggy code:
S=input()
if(S in 'AC'):
 print('Yes')
else:
 print('No')

Fixed code:


S = input()

if "AC" in S:
    print("Yes")
else:
    print("No")
Buggy code:
s = input()
if s in "AC":
    print("Yes")
else:
    print("No")


Fixed code:
s = input()

if 'AC' in s:
    print("Yes")

else:
    print("No")
Buggy code:
if "AC" in input():
    print("Yes")
else
    print("No")

Fixed code:
if "AC" in input():
    print("Yes")
else:
    print("No")
Buggy code:
from collections import deque
S=input()
deque_S=deque(S)
flag=0
ans=0
while True:
    if deque_S[0] == deque_S[-1]:
        deque_S.pop()
        deque_S.popleft()
    else:
        if deque_S[0] == 'x':
            ans+=1
            deque_S.pop()
        elif deque_S[-1] == 'x':
            ans+=1
            deque_S.popleft()
        else:
            flag=1
            break
    if len(deque_S)<=1:
        break
if flag==1:
    print(-1)
else:
    print(ans)


Fixed code:
from collections import deque
S=input()
deque_S=deque(S)
flag=0
ans=0
while True:
    if len(deque_S)<=1:
        break
    if deque_S[0] == deque_S[-1]:
        deque_S.pop()
        deque_S.popleft()
    else:
        if deque_S[0] == 'x':
            ans+=1
            deque_S.popleft()
        elif deque_S[-1] == 'x':
            ans+=1
            deque_S.pop()
        else:
            flag=1
            break
if flag==1:
    print(-1)
else:
    print(ans)
Buggy code:
A=list(input())
from collections import deque
A=deque(A)
cnt=0
while len(A)>1:
   if A[0]==A[-1]:
      A.pop()
      A.popleft()
   elif (A[0]!="x" and A[-1]=="x" ):
      cnt+=1
      A.pop()
   elif (A[0]=="x" and A[-1]!="x" ):
      cnt+=1
      A.popleft()
   else:
      print(-1,A)
      exit()
print(cnt)

Fixed code:
A=list(input())
from collections import deque
A=deque(A)
cnt=0
while len(A)>1:
   if A[0]==A[-1]:
      A.pop()
      A.popleft()
   elif (A[0]!="x" and A[-1]=="x" ):
      cnt+=1
      A.pop()
   elif (A[0]=="x" and A[-1]!="x" ):
      cnt+=1
      A.popleft()
   else:
      print(-1)
      exit()
print(cnt)
Buggy code:
def main():
    s = input()
    N = len(s)

    nox = []
    idxs = []
    ans = 0
    for i, c in enumerate(s):
        if c != "x":
            nox.append(c)
            idxs.append(i)
    
    if nox != nox[::-1]:
        print(-1)
        exit()
    
    if len(nox) == 0:
        print(0)
        exit()

    if len(nox)%2 == 0:
        left = len(nox)//2 - 1
        right = len(nox)//2
        
        left_idx = idxs[left]
        right_idx = idxs[right]
        print(left_idx, right_idx, ans)

    else:
        center = len(nox)//2
        left_idx = idxs[center]
        right_idx = idxs[center]
        
    while not(left_idx == 0 and right_idx == N-1):
        if s[left_idx] == s[right_idx]:
            if left_idx > 0 and right_idx < N - 1:
                left_idx -= 1
                right_idx += 1
            else:
                if left_idx <= idxs[0] and right_idx >= idxs[-1] and (left_idx > 0 or right_idx < N - 1):
                    ans += 1
                if left_idx > 0:
                    left_idx -= 1
                if right_idx < N-1:
                    right_idx += 1

        elif s[left_idx] == "x":
            ans += 1
            if left_idx > 0:
                left_idx -= 1
        elif s[right_idx] == "x":
            ans += 1
            if right_idx < N-1:
                right_idx += 1

if __name__ == "__main__":
    main()


Fixed code:
def main():
    s = input()
    N = len(s)

    nox = []
    idxs = []
    ans = 0
    for i, c in enumerate(s):
        if c != "x":
            nox.append(c)
            idxs.append(i)
    
    if nox != nox[::-1]:
        print(-1)
        exit()
    
    if len(nox) == 0:
        print(0)
        exit()

    if len(nox)%2 == 0:
        left = len(nox)//2 - 1
        right = len(nox)//2
        
        left_idx = idxs[left]
        right_idx = idxs[right]

    else:
        center = len(nox)//2
        left_idx = idxs[center]
        right_idx = idxs[center]

    while not(left_idx == 0 and right_idx == N-1):
        if s[left_idx] == s[right_idx]:
            if left_idx > 0 and right_idx < N - 1:
                left_idx -= 1
                right_idx += 1
            else:
                if left_idx <= idxs[0] and right_idx >= idxs[-1] and (left_idx > 0 or right_idx < N - 1):
                    ans += 1
                if left_idx > 0:
                    left_idx -= 1
                if right_idx < N-1:
                    right_idx += 1

        elif s[left_idx] == "x":
            ans += 1
            if left_idx > 0:
                left_idx -= 1
        elif s[right_idx] == "x":
            ans += 1
            if right_idx < N-1:
                right_idx += 1
    print(ans)

if __name__ == "__main__":
    main()
Buggy code:
s = input()

core = []

for c in s:
    if c != 'x':
        core.append(c)
if core == []:
    print(0)
    exit()
l = 0
r = len(core) - 1

while l <= r:
    if core[l] != core[r]:
        print(-1)
        exit()
    l += 1
    r -= 1

ans = 0
l = 0
r = len(s) - 1

while l <= r:
    print(l, r)
    lx = 0
    rx = 0
    while s[l] == 'x':
        l += 1
        lx += 1
    while s[r] == 'x':
        r -= 1
        rx += 1
    ans += abs(lx - rx)
    l += 1
    r -= 1
print(ans)


Fixed code:
s = input()

core = []

for c in s:
    if c != 'x':
        core.append(c)
if core == []:
    print(0)
    exit()
l = 0
r = len(core) - 1

while l <= r:
    if core[l] != core[r]:
        print(-1)
        exit()
    l += 1
    r -= 1

ans = 0
l = 0
r = len(s) - 1

while l <= r:
    lx = 0
    rx = 0
    while s[l] == 'x':
        l += 1
        lx += 1
    while s[r] == 'x':
        r -= 1
        rx += 1
    ans += abs(lx - rx)
    l += 1
    r -= 1
print(ans)
Buggy code:
import sys
read = sys.stdin.buffer.read
input = sys.stdin.readline
#input = sys.stdin.buffer.readline


#sys.setrecursionlimit(10**9)
#from functools import lru_cache

def RD(): return sys.stdin.read()
def II(): return int(input())
def MI(): return map(int,input().split())
def MF(): return map(float,input().split())
def LI(): return list(map(int,input().split()))
def LF(): return list(map(float,input().split()))
def TI(): return tuple(map(int,input().split()))
# rstrip().decode()

#import numpy as np

def main():
	s=input()

	n=len(s)

	l=0
	r=n-1

	ans=0

	while s[l:r+1]:

		if s[l]==s[r]:
			l+=1
			r-=1

		elif s[l]=="x":
			ans+=1
			l+=1

		elif s[r]=="x":
			ans+=1
			r-=1

		else:
			print(-1)
			exit()

	print(ans)

if __name__ == "__main__":
	main()


Fixed code:
"""
import sys
read = sys.stdin.buffer.read
input = sys.stdin.readline
#input = sys.stdin.buffer.readline


#sys.setrecursionlimit(10**9)
#from functools import lru_cache

def RD(): return sys.stdin.read()
def II(): return int(input())
def MI(): return map(int,input().split())
def MF(): return map(float,input().split())
def LI(): return list(map(int,input().split()))
def LF(): return list(map(float,input().split()))
def TI(): return tuple(map(int,input().split()))
# rstrip().decode()

#import numpy as np
"""

def main():
	s=input()

	n=len(s)

	l=0
	r=n-1

	ans=0

	while l<r:

		if s[l]==s[r]:
			l+=1
			r-=1

		elif s[l]=="x":
			ans+=1
			l+=1

		elif s[r]=="x":
			ans+=1
			r-=1

		else:
			print(-1)
			exit()

	print(ans)
	return

if __name__ == "__main__":
	main()
Buggy code:
s = input()
n = len(s)

sr = s.replace("x", "")

if sr != "".join(reversed(sr)):
    print(-1)
else:
    ans = 0
    l = 0
    r = -1
    while l < n and -r <= n:
        if s[l] == s[r]:
            l += 1
            r -= 1
            continue
        elif s[l] == "x" and s[r] != "x":
            ans += 1
            l += 1
        elif s[l] != "x" and s[r] == "x":
            ans += 1
            r -= 1
    print(ans)


Fixed code:
s = input()
n = len(s)

sr = s.replace("x", "")

if sr != "".join(reversed(sr)):
    print(-1)
else:
    ans = 0
    l = 0
    r = -1
    while l - r < n:
        if s[l] == s[r]:
            l += 1
            r -= 1
            continue
        elif s[l] == "x" and s[r] != "x":
            ans += 1
            l += 1
        elif s[l] != "x" and s[r] == "x":
            ans += 1
            r -= 1
        
    print(ans)
Buggy code:
import sys

# import re
import math
import collections
# import decimal
import bisect
import itertools
import fractions
# import functools
import copy
import heapq
import decimal
# import statistics
import queue

sys.setrecursionlimit(10000001)
INF = 10 ** 16
MOD = 10 ** 9 + 7

ni = lambda: int(sys.stdin.readline())
ns = lambda: map(int, sys.stdin.readline().split())
na = lambda: list(map(int, sys.stdin.readline().split()))


# ===CODE===


def main():
    s = list(input())

    characters = []

    for si in s:
        if si != "x":
            characters.append(si)

    flg = True
    odd = len(characters) % 2
    for i in range(len(characters) // 2):
        if characters[i] != characters[-i - 1]:
            flg = False

    if not flg:
        print(-1)
        exit(0)

    if len(characters) < 2:
        print(0)

    idx = -1
    cntlist = []
    for c in characters:
        cnt = 0
        for i in range(idx + 1, len(s)):
            if c == s[i]:
                cntlist.append(cnt)
                idx = i
                break
            else:
                cnt += 1
    cntlist.append(len(s) - (len(characters) + sum(cntlist)))

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


if __name__ == '__main__':
    main()


Fixed code:
import sys

# import re
import math
import collections
# import decimal
import bisect
import itertools
import fractions
# import functools
import copy
import heapq
import decimal
# import statistics
import queue

sys.setrecursionlimit(10000001)
INF = 10 ** 16
MOD = 10 ** 9 + 7

ni = lambda: int(sys.stdin.readline())
ns = lambda: map(int, sys.stdin.readline().split())
na = lambda: list(map(int, sys.stdin.readline().split()))


# ===CODE===


def main():
    s = list(input())

    characters = []
    cnt = []
    counter = 0
    for si in s:
        if si != "x":
            characters.append(si)
            cnt.append(counter)
            counter = 0
        else:
            counter += 1
    cnt.append(counter)

    flg = True
    odd = len(characters) % 2
    for i in range(len(characters) // 2):
        if characters[i] != characters[-i - 1]:
            flg = False

    if not flg:
        print(-1)
        exit(0)

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


if __name__ == '__main__':
    main()
Buggy code:
s = input()
t = s.replace("x", "")

flag = 1
for i in range(len(t)):
    if t[i] != t[~i]:
        flag = 0

if flag == 0:
    print(-1)
else:
    ans = 0
    t = s[::-1]
    c = 0
    for i in range(len(s)):
        if c >= len(t):
            if s[i] == "x":
                ans += 1
            continue
        if t[c] == s[i]:
            c += 1
            continue
        else:
            if s[i] == "x":
                ans += 1
                continue
            else:
                while t[c] == "x":
                    ans += 1
                    c += 1
                else:
                    c += 1
    print(ans//2)


Fixed code:
s = input()
t = s.replace("x", "")

flag = 1
for i in range(len(t)):
    if t[i] != t[~i]:
        flag = 0

if flag == 0:
    print(-1)
else:
    ans = 0
    t = s[::-1]
    c = 0
    for i in range(len(s)):
        if c >= len(t):
            if s[i] == "x":
                ans += 1
            continue
        if t[c] == s[i]:
            c += 1
            continue
        else:
            if s[i] == "x":
                ans += 1
                continue
            else:
                while t[c] == "x":
                    ans += 1
                    c += 1
                else:
                    c += 1
    ans += len(t) - c
    print(ans//2)
Buggy code:
import sys
stdin = sys.stdin
sys.setrecursionlimit(10**6)
ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
nn = lambda: list(stdin.readline().split())
ns = lambda: stdin.readline().rstrip()

s = ns()
ans = 0
r = 0
l = len(s)-1
while r < l:
  if s[r] == s[l]:
    r += 1
    l -= 1
  elif s[r] == "x":
    ans += 1
    r += 1
  elif s[l] == "x":
    rns += 1
    l -= 1
  else:
    print(-1)
    exit()

print(r)

Fixed code:
import sys
stdin = sys.stdin
sys.setrecursionlimit(10**6)
ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
nn = lambda: list(stdin.readline().split())
ns = lambda: stdin.readline().rstrip()

s = ns()
ans = 0
r = 0
l = len(s)-1
while r < l:
  if s[r] == s[l]:
    r += 1
    l -= 1
  elif s[r] == "x":
    ans += 1
    r += 1
  elif s[l] == "x":
    ans += 1
    l -= 1
  else:
    print(-1)
    exit()

print(ans)
Buggy code:
s = input()
N = len(s)

def solve2():
    l = 0
    r = N - 1
    cost = 0
    while l < r:
        if s[l] == s[r]:
            l += 1
            r += 1
        elif s[l] == 'x':
            cost += 1
            l += 1
        elif s[r] == 'x':
            cost += 1
            r -= 1
        else:
            return -1
    return cost

print(solve2())


Fixed code:
s = input()
N = len(s)

def solve():
    l = 0
    r = N - 1
    cost = 0
    while l < r:
        if s[l] == s[r]:
            l += 1
            r -= 1
        elif s[l] == 'x':
            cost += 1
            l += 1
        elif s[r] == 'x':
            cost += 1
            r -= 1
        else:
            return -1
    return cost

print(solve())
Buggy code:
from collections import defaultdict, deque, Counter
from heapq import heappush, heappop, heapify
from bisect import bisect_right, bisect_left
import random
from itertools import permutations, accumulate, combinations, product
import sys
import string
from bisect import bisect_left, bisect_right
from math import factorial, ceil, floor, gamma, log
from operator import mul
from functools import reduce
from copy import deepcopy

sys.setrecursionlimit(2147483647)
INF = 10 ** 20
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
mod = 10 ** 9 + 7


s = S()
no_x = ''.join(s.split('x'))
if no_x[::-1] != no_x:
    print(-1)
else:
    L = []
    cnt = 0
    print(no_x)
    if not no_x:
        print(0)
        exit()
    for i in s:
        if i == 'x':
            cnt += 1
        else:
            L += [cnt]
            cnt = 0
    L += [cnt]
    ans = 0
    for i in range(len(no_x) + 1):
        abs(L[i] - L[len(no_x) - i])
    print(ans // 2)

Fixed code:
from collections import defaultdict, deque, Counter
from heapq import heappush, heappop, heapify
from bisect import bisect_right, bisect_left
import random
from itertools import permutations, accumulate, combinations, product
import sys
import string
from bisect import bisect_left, bisect_right
from math import factorial, ceil, floor, gamma, log
from operator import mul
from functools import reduce
from copy import deepcopy

sys.setrecursionlimit(2147483647)
INF = 10 ** 20
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
mod = 10 ** 9 + 7


s = S()
no_x = ''.join(s.split('x'))
if no_x[::-1] != no_x:
    print(-1)
else:
    L = []
    cnt = 0
    if not no_x:
        print(0)
        exit()
    for i in s:
        if i == 'x':
            cnt += 1
        else:
            L += [cnt]
            cnt = 0
    L += [cnt]
    ans = 0
    for i in range(len(no_x) + 1):
        ans += abs(L[i] - L[len(no_x) - i])
    print(ans // 2)