A = list(map(int,input().split()))
B = list(map(int,input().split()))
C = list(map(int,input().split()))

dct = [["A",A[0],A[1]], ["B",B[0],B[1]], ["C",C[0],C[1]]]
dct.sort(key=lambda x:(-x[1],x[2]))
for i in range(3):
    print(dct[i][0])