func_code_string: #include <bits/stdc++.h>   using namespace std;   int l, r;   string s;   bool b_occured[10];   bool judge() {     memset(b_occured, 0, sizeof(b_occured));     bool ret = false;     for (int i = 0; i < s.length(); i++) {       if (b_occured[s[i] -  0 ] == false)         b_occured[s[i] -  0 ] = true;       else {         ret = true;       }     }     return ret;   }   int main() {     cin >> l >> r;     s = to_string(l);     while (judge()) {       l++;       s = to_string(l);     }     if (l <= r)       cout << l <<   n ;     else       cout <<  -1 n ;     return 0;   }   