//???????
//?  ????
//?  ??2011.10.12
int main()
{
	int A, B, C;
	int a, b, c;
	int t,k;
	char ch1, ch2, ch3;
	for (A = 1; A < 4; A++)
		for (B = 1; B < 4; B++)
			for (C = 1; C < 4; C++)
			{
				a = (B > A) + (C == A);
			    b = (A > B) + (A > C);
				c = (C > B) + (B > A);
				if ((((A > B) && (a < b)) || ((A == B) && (a == b)) || ((A < B) && (a > b))) 
                  + (((B > C) && (b < c)) || ((B == C) && (b == c)) || ((B < C) && (b > c)))
				  + (((C > A) && (c < a)) || ((C == A) && (c == a)) || ((C < A) && (c > a))) ==  3)
				{
					/*if (A <= B)
						t = A; A = B; B = t;
					if (B <= C)
						t = B; B = C; C = t;
					if (A <= C)
						t = A; A = C; C = t;*/
                   //ch1 = A + 64; ch2 = B + 64; ch3 = C + 64;
			       //cout << ch1 << ch2 << ch3 << endl;
					for(k = 1; k <= 3; k++)
					{
						if(A == k) cout << "A";
						if(B == k) cout << "B";
						if(C == k) cout << "C";
					}
                   cout << endl;
			       return 0;
				}
			}
		   

}