func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     string s;     cin >> s;     int ct = 0, i, j;     map<char, int> mp1;     int len = s.length();     int bc, rc, gc;     gc = rc = bc = 0;     for (i = 0; i < len; i++) {       if (s[i] ==  R ) rc++;       if (s[i] ==  G ) gc++;       if (s[i] ==  B ) bc++;     }     if (gc > 0 && bc > 0 && rc > 0)       printf( BGR n );     else if (gc == 0) {       if (rc == 0)         printf( B );       else if (bc == 0)         printf( R );       else if (rc == 1 && bc == 1)         printf( G );       else if (rc > 1 && bc == 1)         printf( BG );       else if (bc > 1 && rc == 1)         printf( GR );       else         printf( BGR );     } else if (bc == 0) {       if (gc == 0)         printf( R );       else if (rc == 0)         printf( G );       else if (gc == 1 && rc == 1)         printf( B );       else if (rc > 1 && gc == 1)         printf( BG );       else if (gc > 1 && rc == 1)         printf( BR );       else         printf( BGR );     } else if (rc == 0) {       if (gc == 0)         printf( B );       else if (bc == 0)         printf( G );       else if (gc == 1 && bc == 1)         printf( R );       else if (bc > 1 && gc == 1)         printf( GR );       else if (gc > 1 && bc == 1)         printf( BR );       else         printf( BGR );     }     return 0;   }   