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 OCaml (4.10.0) (judge verdict: Accepted)

(* unihernandez22
 * https://atcoder.jp/contests/abc171/tasks/abc171_a
 * implementation
 * *)

let is_uppercase = function
    'A' .. 'Z' -> true
    | _ -> false;;

Printf.printf "%c\n" @@
Scanf.scanf "%c" @@ fun a ->
    if is_uppercase a then 'A'
    else 'a';;