#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#define Rep(i,a,n)for(int i=(int)(a);i<(int)(n);i++)
#define rep(i,n)Rep(i,0,n)
typedef long long ll;
typedef long double ld;
#define Ma(x,y) ((x)>(y)?(x):(y))
#define mi(x,y) ((x)<(y)?(x):(y))

int main() {
	int k; char s[101] = { '\0' };
	scanf("%d\n%s",&k,s);
	if (strlen(s) <= k)printf("%s", s);
	else { rep(i, k)printf("%c", s[i]); printf("..."); }
}