func_code_string: #include <bits/stdc++.h>   using namespace std;   long long ex(long long a, long long b) {     long long tmp = 1;     for (int i = 0; i < b; i++) {       tmp = tmp * a;     }     return tmp;   }   int main() {     long long r, l, tmp, ans = -1;     bool good = 1;     cin >> l >> r;     for (long long i = l; i <= r; i++) {       for (long long k = 0; k <= 5; k++) {         for (long long j = 0; j <= 5; j++) {           if (i / (ex(10, j)) % 10 == (i / (ex(10, k))) % 10 && ex(10, k) <= i &&               ex(10, j) <= i && j != k) {             good = 0;           }         }       }       if (good) {         ans = i;       }       good = 1;     }     cout << ans << endl;   }   