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: Accepted)

(defun input ()
  (coerce (read-line) 'character))

(defun cap? (code)
  (cond ((< code 91) t)
		(t nil)))

(defun main ()
  (let* ((chr (input))
		(code (char-code chr)))
	(if (cap? code)
	  (format t "A~%")
	  (format t "a~%")
	  )))

(main)