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)

fn main() {
    let (k, s) = input();
    println!("{}", solve(k, s));
}

fn input() -> (usize, String) {
    let mut buf1 = String::new();
    let mut buf2 = String::new();
    std::io::stdin().read_line(&mut buf1).unwrap();
    std::io::stdin().read_line(&mut buf2).unwrap();
    buf1.pop();
    buf2.pop();
    let k: usize = buf1.parse().unwrap();
    (k, buf2)
}

fn solve(k: usize, s: String) -> String {
    if k >= s.len() {
        return s;
    }
    format!("{}{}", &s[..k].to_string(), String::from("..."))
}