Bank Number Generator

#include <iostream>

using namespace std;

int main() {
    int a;
    cin >> a;

    char b, c, d;
    cin >> b >> c >> d;

    int e, n;
    cin >> e >> n;

    for (int i = a; i <= 99; i++) {
        for (char j = b; j <= 'Z'; j++) {
            for (char k = c; k <= 'z'; k++) {
                for (char l = d; l <= 'Z'; l++) {
                    for (int m = e; m >= 10; m--) {
                        if (i % 10 == 2 && m % 10 == 5) {
                            n--;
                            if (n == 0) {
                                cout << i << j << k << l << m << endl;
                                return 0;
                            }
                        }
                    }
                }
            }
        }
    }

    return 0;
}