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|.
a,b,c=input().split()
a=int(a)
b=int(b)
c=int(c)
if (b-a)>=(c-b):
  print(c-b)
else:
  print(b-a)
a,b,c=input().split()
a=int(a)
b=int(b)
c=int(c)
if abs(b-a)>abs(c-a):
  print("B")
else:
  print("A")