/*
 * ????bifanliang.cpp
 * ??????
 * ?????2012 11 9
 * ??????????
 */



int main(){
	int a,b,c,i;               //???????abc??????i
	i=0;                       //i???0
	for(a=1;a<=3;a++){
		for(b=1;b<=3;b++){
			if (b==a) continue;
			c=6-a-b;           //????abc?????abc????
			if ((((b<a)+(c==a))==(a-1)) && (((a<b)+(a<c))==(b-1)) && (((c<b)+(b<a))==(c-1))){
				//????????????????
			char order[4];
			           order[a]='A';
			           order[b]='B';
			           order[c]='C';     //???????????ABC?????
			           cout <<order[3]<<order[2]<<order[1]<<endl;   //?????ABC
			           i=1;              //???????1
			           break;            //????
			}
		}
		if (i==1) break;                 //????????????
	}
	return 0;
}
