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 mut buf = String::new();
    std::io::stdin().read_line(&mut buf).unwrap();
    let mut iter = buf.split_whitespace();
    let a: String = iter.next().unwrap().parse().unwrap();
    let b: String = iter.next().unwrap().parse().unwrap();
    let c: String = iter.next().unwrap().parse().unwrap();
    let mut abc: String = "".to_string();
    abc.push( a.chars().nth(0).unwrap() );
    abc.push( b.chars().nth(0).unwrap() );
    abc.push( c.chars().nth(0).unwrap() );
    let ABC = abc.to_uppercase();
    println!("{}", ABC);
}