Snuke lives at position x on a number line. On this line, there are two stores A and B, respectively at position a and b, that offer food for delivery.  Snuke decided to get food delivery from the closer of stores A and B. Find out which store is closer to Snuke's residence.  Here, the distance between two points s and t on a number line is represented by |s-t|.
x, a, b = list(map(int, input().split()))

if abs(a-x) > abs(b-x):
	print('A')
else:
	print('B')
x, a, b = list(map(int, input().split()))

if abs(a-x) < abs(b-x):
	print('A')
else:
	print('B')