ah,aw = map(int, input().split(' '))
bh,bw = map(int, input().split(' '))
ch,cw = map(int, input().split(' '))

d = {}
d['A'] = ah * 1000 + 1000 - aw
d['B'] = bh * 1000 + 1000 - bw
d['C'] = ch * 1000 + 1000 - cw

while(len(d.keys()) > 0):
    print(max(d, key=d.get))
    d.pop(max(d, key=d.get))