output_description: If store A is closer, print `A`; if store B is closer, print `B`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      x a b
attempt: a,b,c=(int(x) for x in input().split())
  if a < b < c:
      print( 'A' )
  elif a < c < b:
      print( 'A' )
  elif b < a < c:
      print( 'B' )
  elif b < c < a:
      print( 'B' )
  elif c < a < b:
      print( 'C' )
  elif c < b < a
problem_description: Statement
  
  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|.
samples: [{"input": "5 2 7", "output": "B\n    \n\nThe distances between Snuke's residence and stores A and B are 3 and 2,\nrespectively. Since store B is closer, print `B`.\n\n* * *"}, {"input": "1 999 1000", "output": "A"}]