#include <bits/stdc++.h>

using namespace std;

int main() {
    char a, b, c;
    for (a = 'x'; a <= 'z'; a++) {
        for (b = 'x'; b <= 'z'; b++) {
            for (c = 'x'; c <= 'z'; c++) {
                if (a != b && a != c && b != c && a != 'x' && c != 'x' && c != 'z') {      //避免参赛队员重复比赛
                    printf("a和%d,b和%d，c和%c进行比赛", a, b, c);
                }
            }
        }
    }
}