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();
	io::stdin().read_line(&mut buf).expect("");
	let iter = buf.split_whitespace();
	let mut v:Vec<Vec<char>> = Vec::new();
	for i in iter {
		v.push(i.chars().collect::<Vec<char>>());
	}
	let s1 = v[0].clone();
	let s1c = s1[0].to_uppercase().collect::<Vec<char>>();
	let s2 = v[1].clone();
	let s2c = s2[0].to_uppercase().collect::<Vec<char>>();
	let s3 = v[2].clone();
	let s3c = s3[0].to_uppercase().collect::<Vec<char>>();
	let s = format!("{}{}{}", s1c[0], s2c[0], s3c[0]);
	println!("{}", s);
}