# Read input
ha, wa = map(int, input().split())
hb, wb = map(int, input().split())
hc, wc = map(int, input().split())

# Create list of people with their attributes
people = [
    (ha, wa, 'A'),
    (hb, wb, 'B'),
    (hc, wc, 'C'),
]

# Sort by descending height, then ascending weight
sorted_people = sorted(people, key=lambda x: (-x[0], x[1]))

# Output the names in order
for p in sorted_people:
    print(p[2])