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.Generic;
using System.Text;

class Program
{
    static void Main(string[] args)
    {
        var num = int.Parse(Console.ReadLine());
        var sampleText =Console.ReadLine();
        var b = new List<string>();
        if(sampleText.Length > num)
        {
            for(var i = 0; i < num;i++)
            {
                b.Add(sampleText[i].ToString());
            }
            b.Add("...");
        }
        else{
            b.Add(sampleText);
        }
        var sb = new StringBuilder();
        foreach(var a in b)
        {
            sb.Append(a);
        }
        Console.WriteLine(sb.ToString());

    }
  
}