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 Rust (1.42.0) (judge verdict: Wrong Answer)

use std::io::stdin;

fn main() {
  let mut str = String::new();
  stdin().read_line(&mut str).unwrap();
  let char = str.chars().next().unwrap();
  if(char.is_uppercase()) {
    println!("{}", char.to_ascii_lowercase());
  } else if(char.is_lowercase()) {
    println!("{}", char.to_ascii_uppercase());
  }
}