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 Ruby (2.7.1) (judge verdict: Runtime Error)

#!/usr/bin/env ruby
a = gets.chomp.split(' ')
nums = gets.chomp
q = gets.chomp.to_i

o = Array.new
q.times do
  i = gets.chomp.split(' ')
  nums.gsub!(i[0], i[1])
  p nums.split(' ').map(&:to_i).sum
end