Problem:
Score : 100 points

Problem 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.

Constraints

\alpha is an uppercase (A - Z) or lowercase (a - z) English letter.

Input

Input is given from Standard Input in the following format:

α

Output

If \alpha is uppercase, print A; if it is lowercase, print a.

Sample Input 1

B

Sample Output 1

A

B is uppercase, so we should print A.

Sample Input 2

a

Sample Output 2

a

a is lowercase, so we should print a.

Solution in Common Lisp (SBCL 2.0.3) (judge verdict: Wrong Answer)

(defun letter-check (string)
  (string= (string-upcase string) string)
  )

(defun solve (string)
  (if (letter-check string)
      (princ "A")
      (princ "a")
  )
)
 (solve (read))