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 = map(int, input().split())
if A-X < B-X:
  print("A")
else:
  print("B")
  
X,A,B = map(int, input().split())
if abs(A-X) < abs(B-X):
  print("A")
else:
  print("B")