#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#define BUFSIZE 10000000
typedef long long ll;
#define WDSIZE 10000

int K;
char a[BUFSIZE]={0};


int main(void){
  scanf("%d\n",&K);
  for(int i = 0;i < BUFSIZE;i++){
    scanf("%c",&a[i]);
    if(a[i] == '\n')   break;
  }

  if(K >= strlen(a)){
    for(int i = 0; i < strlen(a);i++){
      if(a[i] == '\n') a[i] = '\0';
       printf("%c",a[i]);
     }
  }else{
    for(int i = 0;i < K ;i++){
    printf("%c",a[i]);
    if(i == K-1){
       printf("...");
       break;
     }
    }
  }



}
