x = [int(input()) for i in range(3)]
a = x[0]
b = x[1]
c = x[2]

x.sort()

if a == x[2]:
    print("A")
elif b == x[2]:
    print("B")
else:
    print("C")

if a == x[1]:
    print("A")
elif b == x[1]:
    print("B")
else:
    print("C")

if a == x[0]:
    print("A")
elif b == x[0]:
    print("B")
else:
    print("C")