output_description: If \alpha is uppercase, print `A`; if it is lowercase, print `a`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      α
attempt: #!python3.8
  # -*- coding: utf-8 -*-
  # abc171/abc171_a
  import sys
  
  s2nn = lambda s: [int(c) for c in s.split(" ")]
  ss2nn = lambda ss: [int(s) for s in list(ss)]
  ss2nnn = lambda ss: [s2nn(s) for s in list(ss)]
  i2s = lambda: sys.stdin.readline().rstrip()
  i2n = lambda: int(i2s())
  i2nn = lambda: s2nn(i2s())
  ii2ss = lambda n: [i2s() for _ in range(n)]
  ii2nn = lambda n: ss2nn(ii2ss(n))
  ii2nnn = lambda n: ss2nnn(ii2ss(n))
  
  
  def main():
      a = i2s()
      print("A" if a.isupper() else "a")
      return
  
  
  main()
  
problem_description: Statement
  
  An uppercase or lowercase English letter \alpha will be given as input. If
  \alpha is uppercase, print `A`; if it is lowercase, print `a`.
samples: [{"input": "B", "output": "A\n    \n\n`B` is uppercase, so we should print `A`.\n\n* * *"}, {"input": "a", "output": "a\n    \n\n`a` is lowercase, so we should print `a`."}]