def main():
    HW = tuple(tuple(map(int, input().split())) for _ in [0] * 3)

    brother = []
    append_ = brother.append
    for i in range(3):
        append_([chr(65+i), HW[i][0], HW[i][1]])

    brother.sort(key=lambda w: w[2])
    brother.sort(key=lambda w: w[1], reverse=True)
    for s in brother:
        print(s[0])

main()