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;

namespace abc168_b
{
    class Program
    {
        static void Main(string[] args)
        {
            var maxNum = int.Parse(Console.ReadLine());
            var inputText = Console.ReadLine();

            // 入力された文字列が指定文字数以上の場合切り取る
            Console.WriteLine(AcquireDisplayText(maxNum, inputText));
            Console.Read();
        }

        /// <summary>
        /// 入力された文字が指定文字数以上の場合、先頭から指定文字数分のみ切り取り「...」を加える
        /// </summary>
        /// <param name="maxNum"></param>
        /// <param name="inputText"></param>
        /// <returns></returns>
        private static string AcquireDisplayText(int maxNum, string inputText)
        {
            if (inputText.Length >= maxNum)
            {
                var resultText = "";

                for (int i = 0; i < maxNum; i++)
                {
                    resultText += inputText[i];
                }

                resultText += "...";

                return resultText;
            }

            return inputText;
        }
    }
}