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