func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int l, r;     cin >> l >> r;     for (int i = l; i < r + 1; i++) {       vector<int> cnts(10);       int x = i;       while (x > 0) {         cnts[x % 10]++;         x /= 10;       }       bool good = true;       for (int j = 0; j < 10; j++) {         if (cnts[j] > 1) {           good = false;         }       }       if (good) {         cout << i << endl;         return 0;       }     }     cout << -1 << endl;     return 0;   }   