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 proconio::{fastout, input};
use regex::Regex;

fn main() {
    input!(alpha: String);
    let upper = Regex::new(r"[A-Z]").unwrap();
    let lower = Regex::new(r"[a-z]").unwrap();
    if upper.is_match(alpha.as_str()) {
        println!("A")
    } else if lower.is_match(alpha.as_str()) {
        println!("a")
    }
}