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: Accepted)

use std::io;

fn main() -> io::Result<()>{
    let stdin = io::stdin();
    let mut buf = String::new();
    stdin.read_line(&mut buf)?;
    buf.retain(|c| c!='\n');
    let tmp = buf.chars().nth(0).unwrap();
    if tmp.is_uppercase() {
	println!("A");
    }else{
	println!("a");
    }
    Ok(())
}