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 (GCC 9.2.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
int substr( char *t, const char *s, int pos, int len )
{
    if( pos < 0 || len < 0 || len > strlen(s) )
        return -1;
    for( s += pos; *s != '\0' && len > 0; len-- )
        *t++ = *s++;
    *t = '\0';
    return 0;
}
int main() {
    int K;
    char S[100];
    char S2[100];
    char S4[]="...";
    scanf("%d",&K);
    scanf("%s",&S);
    if(strlen(S)>K)
    {
        substr(S2,S,0,K);
        printf("%s\n",strcat(S2,S4));
    } else{
        printf("%s\n",S);
    }

    return 0;
}