func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     char a[200005];     cin >> a;     for (int i = 0; a[i] !=   0 ; ++i) {       if (i && a[i - 1] == a[i]) {         if (a[i - 1] !=  x  && a[i + 1] !=  x )           a[i] =  x ;         else if (a[i - 1] !=  y  && a[i + 1] !=  y )           a[i] =  y ;         else           a[i] =  z ;       }     }     cout << a << endl;     return 0;   }   