//***************************************************************************************************||
//**********************~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*************************************||
//******************||||      AUTHOR: GUNJAN KUMAR BISWAS       ||||*********************************||
//******************||||      INSTITUTION : JGEC               ||||*********************************||
//******************||||~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~||||*********************************||
//***************************************************************************************************||
// Date : 19.04.20


#include <bits/stdc++.h>
#include <vector>
#include <set>
#include <map>
#include <string>
#include <algorithm>
#include <cmath>
#include <queue>
#include <stack>
using namespace std;



#define f(i,a,b)        for(ll i=a;i<b;i++)
#define f0(i,n)         f(i,0,n)
#define fr(i,a,b)       for(ll i=a;i>=b;i--)
#define pb              push_back
#define tc(t)           int t;cin >>t;while(t--)
#define lol             std::ios::sync_with_stdio(false); cin.tie(NULL);
#define endl            "\n"
#define mp              make_pair
#define ss              second
#define ff              first
#define ll              long long
#define int             long long
#define pii             pair< int,int >
#define pll             pair< ll,ll >
#define sz(a)           a.size()
#define inf             (1000*1000*1000+5)
#define all(a)          a.begin(),a.end()
#define arr(a,n)        int a[n];f0(i, n) cin >> a[i];
#define ini(a,n)        memset(a,n,sizeof(a))
#define printArr(a,n)   f0(i,n) cout<<a[i]<<" ";
#define in              cin>>
#define rr              return 0;
#define vint            vector< int >
#define l_b             lower_bound
#define u_b             upper_bound
#define mod1            1000000007
#define fmap(m)         for(auto i=m.begin();i!=m.end();i++)

void input_File()
{
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
}

///////////// FUNCTIONS//////////


bool isPrime(ll n)          //checks for prime
{
    if (n <= 1)
        return false;
    for (ll i = 2; i < n; i++)
        if (n % i == 0)
            return false;

    return true;
}


ll sumofdigits(ll n)        //returns sum of digit of a no.
{
    ll c = 0;
    while (n > 0)
    {
        c++;
        n /= 10;
    }
    return c;
}




int lolbhai(int n, int r)
{
    long long p = 1, k = 1;
    if (n - r < r)
        r = n - r;
    if (r != 0) {
        while (r) {
            p *= n;
            k *= r;
            long long m = __gcd(p, k);
            p /= m;
            k /= m;
            n--;
            r--;
        }
    }

    else
        p = 1;

    return p;
}


int MaxSubArraySumReturn(int a[], int  n)  //negative thakle o kaaj korbe in O(n)
{

    int sum = 0, best = 0;
    f0(i, n)
    {
        sum = max(a[i], a[i] + sum);
        best = max(best, sum);
    }
    return best;

}




int fact(int n)
{
    int res = 1;
    for (int i = 2; i <= n; i++)
        res = res * i;
    return res;
}


int nCr(int n, int r)
{
    return fact(n) / (fact(r) * fact(n - r));
}

bool sortinrev(const pair<int, int> &a,
               const pair<int, int> &b)
{
    return (a.first > b.first);
}

int countDivisors(int n)
{
    int cnt = 0;
    for (int i = 1; i <= sqrt(n); i++) {
        if (n % i == 0) {
            // If divisors are equal,
            // count only one
            if (n / i == i)
                cnt++;

            else // Otherwise count both
                cnt = cnt + 2;
        }
    }
    return cnt;
}



//*************************************************************************************************//
//*************************************************************************************************//
//*************************************************************************************************//





//***//solver function//***

void rev(int n)
{
    if (n < 1)
        return;
    cout << n << endl;
    rev(n - 1);

}


void solve()
{
    int n;
    cin >> n;
    string s;
    cin >> s;

    int si = s.size();
    if (si <= n)
        cout << s;
    else
    {
        f0(i, n)
        cout << s[i];
        cout << "...";
    }


}//solve end




/////////////////////DRIVER FUNCTION/////////////////
signed main()
{

    input_File();

    lol


    //0 mane no test case......1 mane test case ache

    int isTestCasePresent = 0;
    if (isTestCasePresent == 0)
    {
        int t = 1;
        while (t--)
        {
            solve();
        }
    }
    else
    {
        tc(t)
        {
            solve();


        }
    }





    rr


}

Measured memory_bytes: 3672