func_code_string: #include <bits/stdc++.h>   using namespace std;   char s[200005], s1[200005];   void sol() {     int i, l, xp;     l = strlen(s);     memset(s1, 0, sizeof(s1));     xp = -1;     for (i = 0; i < l; i++) {       if (xp == -1) {         xp++;         s1[xp] = s[i];         continue;       }       if (s1[xp] == s[i])         xp--;       else {         xp++;         s1[xp] = s[i];       }     }     xp++;     s1[xp] = 0;     printf( %s n , s1);   }   int main() {     while (gets(s)) sol();     return 0;   }   