#!/usr/bin/env python

A = input().split()
B = input().split()
C = input().split()

A = int(A[0]) + (1/int(A[1]))
B = int(B[0]) + (1/int(B[1]))
C = int(C[0]) + (1/int(C[1]))
#print(A, B, C)

dct = {'A':A, 'B':B, 'C':C}
for key, value in sorted(dct.items(), reverse=True, key=lambda x:x[1]):
    print(key)