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)

fn main() {
    let s = read();
    let ans = solve(s);
    write(ans);
}

fn read() -> String {
    let mut l1 = String::new();
    std::io::stdin().read_line(&mut l1).ok();
    let s = l1.trim().to_string();

    s
}

fn write(s: String) {
    println!("{}", s);
}

fn solve<'a>(s: String) -> String {
    let c = s.chars().next().unwrap();
    if 'a' <= c && c <= 'z' {
        "a".to_string()
    } else {
        "A".to_string()
    }
    
}