Password Generator

#include <iostream>
#include <iomanip>

using namespace std;

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

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

    int d, e, f, counter;
    cin >> d >> e >> f >> counter;

    for (int i = 1; i <= a; i++) {
        for (char j = 'A'; j <= b; j++) {
            for (char k = 'a'; k <= c; k++) {
                for (int l = 1; l <= d; l++) {
                    for (int m = 1; m <= e; m++) {
                        for (int n = 1; n <= f; n++) {
                            if (--counter == 0) {
                                cout << i << j << k << l << m << n << endl;
                                return 0;
                            }
                        }
                    }
                }
            }
        }
    }

    cout << "No password on this position" << endl;
    return 0;
}