func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int l, r;     cin >> l >> r;     for (int i = l; i <= r; ++i) {       int d[10] = {};       int c = i;       bool ok = true;       while (c) {         if (d[c % 10]) {           ok = false;           break;         }         d[c % 10] += 1;         c /= 10;       }       if (ok) {         cout << i <<   n ;         return 0;       }     }     cout <<  -1 n ;   }   