func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int l, r;     cin >> l >> r;     while (l <= r) {       int arr[9] = {0};       int x = l;       bool diff = 1;       while (x) {         int num = x % 10;         x /= 10;         if (arr[num]) {           diff = 0;           l++;           break;         }         arr[num]++;       }       if (diff) {         cout << l << endl;         return 0;       }     }     cout << -1 << endl;   }   