/**
 * ? ? ?????
 * ?    ?????
 * ????: 2010?11?12?
 * ???????A?B?C????????????????????
*/
int main()
{
	int A, B, C;										//??3?????	
	int As, Bs, Cs;										//??3?????
	int Al, Bl, Cl;										//?????????
	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 ))
	{	//?????????????????
                                             Al = A;	//???????????????????????????????????????
					Bl = B;
					Cl = C;
				}
			}
		}
	}
	if (Al >= Bl && Bl >= Cl)		//????????3???
		cout<<"ABC"<<endl;
	if (Al >= Cl && Cl >= Bl)
		cout<<"BCA"<<endl;
	if (Bl >= Al && Al >= Cl)
		cout<<"BAC"<<endl;
	if (Bl >= Cl && Cl >= Al)
		cout<<"BCA"<<endl;
	if (Cl >= Al && Al >= Bl)
		cout<<"CAB"<<endl;
	if (Cl >= Bl && Bl >= Al)
		cout<<"CBA"<<endl;
	return 0;
}

		
