//**********************************************************
//*   ?  ?   ?: ???.cpp                              *
//*   ?       ?: ? ?                                   *
//*   ? ? ? ?: 2010?10?17?                          *
//**********************************************************
int main()
{
	int A, B, C,i=0;
	int rank[4]={0,0,0,0},words[4]={0,0,0,0};                             //??word????????rank??????????
	for(A=1;A<4;A++)
	{
		for(B=1;B<4;B++)
		{
			if(A==B)  continue;
			C=6-B-A;                                                      //A?B?C???????
			words[1]=(B>A)+(A==C);
			words[2]=(A>B)+(A>C);
			words[3]=(C>B)+(B>A);
			rank[A]=1;
			rank[B]=2;
			rank[C]=3;                                                    //??????????
			if(words[rank[1]]==2&&words[rank[2]]==1&&words[rank[3]]==0)   //???????????
			{
				for(i=1;i<4;i++)
					cout<<(char)(rank[i]+64);
                                                                          //?????????
			}
		}
	}
	return 0;
}