func_code_string: #include <bits/stdc++.h>   using namespace std;   char s[100005];   char b[100005];   int main() {     cin >> s;     int cnt = 0;     char x =  a ;     for (int i = strlen(s); i >= 0; --i) {       if (s[i] >= x) {         x = s[i];         b[cnt++] = x;       }     }     while (cnt--) {       printf( %c , b[cnt]);     }     return 0;   }   