Ha = int(input())
Hb = int(input())
Hc = int(input())
if Ha > Hb and Ha > Hc:
    print("A")
    if Hb > Hc:
        print("B")
        print("C")
    else:
        print("C")
        print("B")
elif Hb > Ha and Hb > Hc:
    print("B")
    if Ha > Hc:
        print("A")
        print("C")
    else:
        print("C")
        print("A")
else:
    print("C")
    if Ha > Hb:
        print("A")
        print("B")
    else:
        print("B")
        print("A")