//*****************************
//* ????1000012865_4      *
//* ??????              *
//* ???2010-11-17          *
//* ??????              *
//*****************************
int main()
{
	int A, B, C, a, b, c;
	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);
				if(((A > B) && (b > a) || (B > A) && (a > b)) && ((A > C) && (c > a) || ( A < C) && (c < a)) && ((B > C) && (c > b) || (C > B) && (b > c)))
				{
					for(int i = 2; i >= 0; i--)
					{
						if(a == i)
							cout << 'A';
						if(b == i)
							cout << 'B';
						if(c == i)
							cout << 'C';
					}
					break;
				}
			}
	return 0;
}