HA = int(input())
HB = int(input())
HC = int(input())
H = [HA,HB,HC]
if max(H) == HA:
    print("A")
    if min(H) == HC:
        print("B")
        print("C")
    else:
        print("C")
        print("B")
elif max(H) == HB:
    print("B")
    if min(H) == HA:
        print("C")
        print("A")
    else:
        print("A")
        print("C")
else:
    print("C")
    if min(H) == HA:
        print("B")
        print("A")
    else:
        print("A")
        print("B")