def main():
    ha, wa = map(int, input().split())
    hb, wb = map(int, input().split())
    hc, wc = map(int, input().split())

    if ha == hb:
        if wa > wb:
            a_is_better_than_b = False
        else:
            a_is_better_than_b = True
    elif ha > hb:
        a_is_better_than_b = True
    else:
        a_is_better_than_b = False

    if ha == hc:
        if wa > wc:
            a_is_better_than_c = False
        else:
            a_is_better_than_c = True
    elif ha > hc:
        a_is_better_than_c = True
    else:
        a_is_better_than_c = False

    if hb == hc:
        if wb > wc:
            b_is_better_than_c = False
        else:
            b_is_better_than_c = True
    elif hb > hc:
        b_is_better_than_c = True
    else:
        b_is_better_than_c = False

    if a_is_better_than_b:
        if b_is_better_than_c:
            print("A")
            print("B")
            print("C")
        else:
            if a_is_better_than_c:
                print("A")
                print("C")
                print("B")
            else:
                print("C")
                print("A")
                print("B")
    else:
        if a_is_better_than_c:
            print("B")
            print("A")
            print("C")
        else:
            if b_is_better_than_c:
                print("B")
                print("C")
                print("A")
            else:
                print("C")
                print("B")
                print("A")

if __name__ == '__main__':
    main()