#!usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Ma Ping

#两个乒乓球队进行比赛，各出三人。甲队为a,b,c三人，乙队为x,y,z三人。已抽签决定比赛名单。
# 有人向队员打听比赛的名单。a说他不和x比，c说他不和x,z比，请编程序找出三队赛手的名单。

for a in ['x','y','z']:
    for b in ['x','y','z']:
        for c in ['x','y','z']:
            if (a!=b) and (a!=b) and (b!=c) and (a!='x') and (c!='x') and (c!='z'):
                print('a和%s b和%s c和%s' %(a,b,c))