func_code_string: #include <bits/stdc++.h>   using namespace std;   ifstream file( input.txt );   using namespace std;   void maker(int x);   int main() {     int y;     cin >> y;     maker(y + 1);   }   void maker(int x) {     int a, b, c, d;     a = (x / 1000) % 10;     b = (x / 100) % 10;     c = (x / 10) % 10;     d = (x / 1) % 10;     while (a == b || a == c || a == d || b == c || b == d || c == d) {       x++;       a = (x / 1000) % 10;       b = (x / 100) % 10;       c = (x / 10) % 10;       d = (x / 1) % 10;     }     cout << (a * 1000 + b * 100 + c * 10 + d);   }   