#include<iostream.h>
void main()
{
    char i,j,k;//i是a的对手，j是b的对手，k是c的对手
    for(i='x';i<='z';i++)
    {
        for(j='x';j<='z';j++)
        {
            for(k='x';k<='z';k++)
            {
                if(i!=j&&i!=k&&j!=k)
                {
                    cout<<i<<" "<<j<<" "<<k<<" ";
                }
            }
        }
    }
}