Submission #3434062

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
int main(){
  string s;cin>>s;
  int l=0,r=s.size()-1;
  int cnt=0;
  for(;;){
    if(l>=r){
      cout<<cnt<<endl;
      break;
    }
    if(s[l]==s[r]){
      l++;
      r--;
      continue;
    }
    if(s[l]!='x'&&s[r]=='x'){
      cnt++;
      r--;
      continue;
    }
    if(s[l]=='x'&&s[r]!='x'){
      cnt++;
      l++;
      continue;
    }
    if(s[l]!='x'&&s[r]!='x'&&s[l]!=s[r]){
      cout<<-1<<endl;
      return 0;
    }
  }
}
      
  

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