func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     bool check = false;     int left, right;     cin >> left >> right;     for (int i = left; i <= right; i++) {       int num = i;       bool ch[10] = {false};       while (num > 0) {         if (ch[num % 10]) break;         ch[num % 10] = true;         num /= 10;       }       if (num == 0) {         cout << i;         check = true;         break;       }     }     if (!check) cout <<  -1 ;     return 0;   }   