/*
 * ????compare eat.cpp
 * ?????
 * ????: 2011-11-3
 * ??????????
 */
int main(){
	int a,b,c;//??????????A,B,C
	int as,bs,cs;//??????????????
	char d[4];
	for(a=1;a<=3;a++)
		for(b=1;b<=3;b++)
			for(c=1;c<=3;c++)
		    {as=(b>a)+(c==a);//A???
	         bs=(a>b)+(a>c);//B???
	         cs=(c>b)+(b>a);//C???
			    if(!(a<=b&&as<=bs||a<=c&&as<=cs||b<=a&&bs<=as||b<=c&&bs<=cs||c<=a&&cs<=as||c<=b&&cs<=bs))//?????????????????
				{
				d[a]='A';d[b]='B';d[c]='C';//????
			    }
			}
	cout<<d[1];
	cout<<d[2];
	cout<<d[3]<<endl;//????????
    return 0;//????
}
