li = []
HA,WA = map(int,input().split())
li.append([HA,1000-WA,"A"])
HB,WB = map(int,input().split())
li.append([HB,1000-WB,"B"])
HC,WC = map(int,input().split())
li.append([HC,1000-WC,"C"])

li.sort()
for i in range(3):
    print(li[-i-1][2])