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

int main()
{
	int A,B,C,a,b,c,x,y,z;
	for(A=1;A<=3;A++)
		for(B=1;B<=3;B++)
			for(C=1;C<=3;C++)
			{
				a=(B>A)+(C==A);b=(A>B)+(A>C);c=(C>B)+(B>A);
				x=(a>b)&&(A<B)||(a==b)&&(A==B)||(a<b)&&(A>B);
				y=(a>c)&&(A<C)||(a==c)&&(A==C)||(a<c)&&(A>C);
				z=(c>b)&&(C<B)||(c==b)&&(C==B)||(c<b)&&(C>B);
				if(x+y+z==3)
				{
					for(int i=1;i<=3;i++)
					{
						if(i==A) cout<<"A";
						if(i==B) cout<<"B";
						if(i==C) cout<<"C";
					}
				}
			}
				return 0;
}