Problem:
Score : 100 points

Problem Statement

You are given three words s_1, s_2 and s_3, each composed of lowercase English letters, with spaces in between.
Print the acronym formed from the uppercased initial letters of the words.

Constraints

s_1, s_2 and s_3 are composed of lowercase English letters.

1 ≤ |s_i| ≤ 10 (1≤i≤3)

Input

Input is given from Standard Input in the following format:

s_1 s_2 s_3

Output

Print the answer.

Sample Input 1

atcoder beginner contest

Sample Output 1

ABC

The initial letters of atcoder, beginner and contest are a, b and c. Uppercase and concatenate them to obtain ABC.

Sample Input 2

resident register number

Sample Output 2

RRN

Sample Input 3

k nearest neighbor

Sample Output 3

KNN

Sample Input 4

async layered coding

Sample Output 4

ALC

Solution in Rust (1.15.1) (judge verdict: Accepted)

use std::io;

fn main() {
    let ab: Vec<String> = read_input_vec();
    println!(
        "{}",
        ab.iter()
            .map(|x| x[0..1].to_uppercase())
            .collect::<String>()
    );
}

fn read_input<T: std::str::FromStr>() -> T {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    return input.parse::<T>().ok().unwrap();
}

fn read_input_vec<T: std::str::FromStr>() -> Vec<T> {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    return input
        .split_whitespace()
        .map(|x| x.parse::<T>().ok().unwrap())
        .collect();
}