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)

#[allow(unused_imports)]
use std::io;
#[allow(unused_imports)]
use std::cmp;

#[allow(dead_code)]
fn getline() -> Vec<String> {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok().unwrap();
    s.split(' ').map(|x| x.trim().to_string()).collect::<Vec<String>>()
}

#[allow(dead_code)]
fn get<T: std::str::FromStr>(s: &String) -> T {
    s.parse().ok().unwrap()
}

fn main() {
    let ss = getline();
    for s in &ss {
        print!("{}", s.chars().collect::<Vec<char>>()
               .first().unwrap().to_uppercase().next().unwrap());
    }
    println!("");
}