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 Python (3.8.2) (judge verdict: Accepted)

#!/usr/bin/env python
"""AtCoder Beginner Contest 168: B - 
https://atcoder.jp/contests/abc168/tasks/abc168_b
"""

__author__ = 'bugttle <bugttle@gmail.com>'


def main():
    K = int(input())
    S = input()

    if len(S) <= K:
        print(S)
    else:
        print("{}...".format(S[0:K]))

if __name__ == '__main__':
    main()