02. Letters Combinations

#include <iostream>

using namespace std;

int main() {
    char x, y, z;
    cin >> x >> y >> z;

    int counter = 0;

    for (int i = x; i <= y; i++) {
        for (int k = x; k <= y; k++) {
            for (int j = x; j <= y; j++) {
                if (i != z && k != z && j != z) {
                    cout << (char)i << (char)k << (char)j << " ";
                    counter++;
                }
            }
        }
    }
    cout << counter << endl;

    return 0;
}