Problem:
Score: 200 points

Problem Statement

We have a string S consisting of lowercase English letters.

If the length of S is at most K, print S without change.

If the length of S exceeds K, extract the first K characters in S, append ... to the end of them, and print the result.

Constraints

K is an integer between 1 and 100 (inclusive).

S is a string consisting of lowercase English letters.

The length of S is between 1 and 100 (inclusive).

Input

Input is given from Standard Input in the following format:

K
S

Output

Print a string as stated in Problem Statement.

Sample Input 1

7
nikoandsolstice

Sample Output 1

nikoand...

nikoandsolstice has a length of 15, which exceeds K=7.

We should extract the first 7 characters in this string, append ... to the end of them, and print the result nikoand....

Sample Input 2

40
ferelibenterhominesidquodvoluntcredunt

Sample Output 2

ferelibenterhominesidquodvoluntcredunt

The famous quote from Gaius Julius Caesar.

Solution in Rust (1.42.0) (judge verdict: Accepted)

use std::io;

fn main() {

	let  mut number = String::new();
	let  mut letter = String::new();  
	io::stdin().read_line(&mut number).unwrap();
	io::stdin().read_line(&mut letter).unwrap();
	//println!("{:?}",number );
	letter.pop();
	let mut v: String = letter.chars().collect();
	//println!("{:?}",v );
	let number: usize = number.trim().parse()
		.expect("number please");
	//println!("{:?}",number );
	if v.len() > number {
		v.split_off(number);
		//let v: char = v.to_string()
		println!("{}",v + "...");
	} else {
		//let v: char = v
		let v = v.to_string();
		println!("{}",v);
	}
	//println!("{:?}",len );





}