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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)

// リストlinesに格納
function main(lines) {
  // 多分この+で新規って意味なんかも
  const K = +lines[0];
  const S = lines[1];
 
  // lengthなのはpythonと一緒で0~kまでをslice
  // ?は三項演算子trueならS.slice(0, K) + '...'
  // falseならそのままSを出力
  let res = K < S.length ? S.slice(0, K) + '...' : S;
 
  console.log(res);
}
 
 
main( require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n") );
 
 
//  入力自体はこっちでするのかも
function splitN(s) {
  return s.split(' ').map(Number);
}