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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Text;


class Program
{
    static void Main(string[] args)
    {
        // 入力
        var k = int.Parse(Console.ReadLine());
        var s = Console.ReadLine();
        //int[] n = Console.ReadLine().Split().Select(int.Parse).ToArray();

        var tmp = "...";
        var ans = "";
        if (s.Length > k)
        {
            var sb = new StringBuilder();
            for (int i = 0; i < k; i++)
            {
                sb.Append(s[i].ToString());
            }
            sb.Append(tmp);
            ans = sb.ToString();
        }
        else
        {
            ans = s;
        }

        // 出力
        Console.WriteLine(ans);
    }
}