/*
* ??????
* ?????
* ???10.11.1
* ???3?????????????? 
* A??B??????C??????? 
* B??A??????A??C??? 
* C????B????B?A???? 
* ????????????????????? 
*????????????3??????
*/

int main ()
{
	int a ,b , c;//??abc?????
	for(a=0;a<3; a++)//???????????
	{
		for(b=0;b<3;b ++)
		{
			for(c =0; c<3; c ++)
			{
				if((a+(b>a)+(c==a))==2 && (b+(a>b)+(a>c))==2 && (c+(c>b)+(b>a))==2)//??????
				{

					if((a==0)&&(b==1)&&(c==2))
						cout<<"ABC";
					if(a==0&&b==2&&c==1)
						cout<<"ACB";
					if(a==1&&b==0&&c==2)
						cout<<"BAC";
					if(a==1&&b==2&&c==0)
						cout<<"CAB";
					if(a==2&&b==0&&c==1)
						cout<<"BCA";
					if(a==2&&b==1&&c==0)
						cout<<"CBA";
					
				}
			}
		}
	}
	return 0;
}
					
