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

A = A + ["A"]
B = B + ["B"]
C = C + ["C"]

ans = []
ans.append(A)
ans.append(B)
ans.append(C)

result = sorted(ans, key=lambda x: (-x[0], x[1]))

for i in range(3):
    print(result[i][2])