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: Wrong Answer)

using System;
using System.Collections.Generic;

namespace test
{
    class MainClass
    {
        public static void Main(string[] args)
        {

            //問題168

            int K = int.Parse(Console.ReadLine());
            string S = Console.ReadLine();

            //for (int i = K; i < S.Length; i++)
            //{
            //    S[i] = 
            //}

            //Console.WriteLine(K);
            //Console.WriteLine(S);
            //Console.WriteLine(S.Length);

            string ans;
            if (K < S.Length)
            {
                ans = S.Remove(K, S.Length - K);
            }
            else
            {
                ans = S;
            }

            string str = "";

            for (int i = 0; i < S.Length - K; i++)
            {
                str += ".";
            }

            Console.WriteLine(ans + str);
            
        }


    }
}