#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define vll vector<ll> // vector <long long>
#define vvll vector< vll > //vector<vector<long long >>
#define vld vector< ld > //vector <double int>
#define vvld vector< vld > //vector <vector<long double>>
#define pll pair<ll ,ll >
#define vpll vector< pll >
#define mp make_pair
#define pb push_back
#define MOD 1000000007
#define endl "\n"
#define flash ios_base::sync_with_stdio(false);cin.tie(NULL);
#define test ll t;read(t);while(t--)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define fst first
#define scd second
#define mll             map<ll,ll>
#define pqg             priority_queue<ll>
#define pqs             priority_queue<ll,vll,greater<ll>>
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define inf             1e18
#define ps(x,y)         fixed<<setprecision(y)<<x
#define forn(i,n) for(ll (i) = 0 ; (i) < (n) ; ++(i))
#define for1(i,n) for(ll (i) = 1 ; (i) <= (n) ; ++(i))
#define forr(i,n) for(ll (i) = (n)-1 ; (i)>=0 ; --(i))
#define forab(i,a,b,c) for(ll (i) = a ; (i) <= (b) ; (i)+=(c))


using namespace std;

////////////////////////////////////////////////////////////////// Inputs /////////////////////////////////
template <typename T>
void read(T &x) {
	cin >> x;
}

template <typename T , typename T0>
void read(T &x, T0 &y) {
	cin >> x >> y;
}

template <typename T , typename T0 , typename T1>
void read(T &x, T0 &y, T1 &z) {
	cin >> x >> y >> z;
}

template <typename T , typename T0 , typename T1 , typename T2>
void read(T &x, T0 &y, T1 &z, T2 &w) {
	cin >> x >> y >> z >> w;
}

template <typename T , typename T0>
void read(pair< T , T0 > &p) {
	cin >> p.fst >> p.scd;
}

template <typename T>
void read(vector< T > &oneD) {
	for (ll i = 0; i < oneD.size(); i++) {
		read(oneD[i]);
	}
}

template <typename T>
void read(T oneD[] , int n) {
	for (ll i = 0; i < n; i++) {
		read(oneD[i]);
	}
}

/////////////////////////////////////////////////////////////////////////// Outputs ////////////////////////////////////////////////////////////////////////////

template <typename T>
void write(T &x) {

	cout << x << " ";
}

template <typename T , typename T0>
void write(T &x, T0 &y) {
	cout << x << " " << y << "\n";
}

template <typename T , typename T0 , typename T1>
void write(T &x, T0 &y, T1 &z) {
	cout << x << " " << y << " " << z << "\n";
}

template <typename T , typename T0 , typename T1 , typename T2>
void write(T &x, T0 &y, T1 &z, T2 &w) {
	cout << x << " " << y << " " << z << " " << w << "\n";
}

template <typename T , typename T0>
void write(pair< T , T0 > &p) {
	write(p.fst);
	write(p.scd);
	cout << endl;
}

template <typename T>
void write(vector< T > &oneD) {
	for (ll i = 0; i < oneD.size(); i++) {
		write(oneD[i]);
	}
	cout << endl;
}

template <typename T>
void write(T oneD[] , int n) {
	for (ll i = 0; i < n; i++) {
		write(oneD[i]);
	}
	cout << endl;
}

template <typename T , typename T0>
void write(map< T , T0 > &mpp) {
	for (auto it : mpp) {
		write(it.fst);
		cout << ": ";
		write(it.scd);
		cout << "\n";
	}
	cout << endl;
}

///////////////////////////////////////////////////////////////////////// Maths //////////////////////////////////////////////////////////////////////////////

vll sieve;
void Sieve(int N) {
	const ll maxn = N;
	sieve.resize(maxn);
	forn(i, maxn) sieve[i] = i;
	sieve[1] = -1;
	sieve[0] = -1;
	forab(i, 2, maxn, 1) if (i == sieve[i]) for (ll j = 2 * i ; j < maxn ; j += i) if (sieve[j] == j) sieve[j] = i;
}


ll extended_GCD(ll a , ll b , ll &x , ll &y) {
	if (a == 0) {
		x = 0;
		y = 1;
		return b;
	}
	ll x1 , y1;
	ll gcd = extended_GCD(b % a , a , x1 , y1);
	x = y1 - (b / a) * x1;
	y = x1;
	return gcd;
}

ll power(ll a, ll b, ll m = MOD) {
	a %= m;
	ll res = 1;
	while (b > 0) {
		if (b & 1)
			res = res * a % m;
		a = a * a % m;
		b >>= 1;
	}
	return res;
}

ll modinv(ll a , ll mod = MOD) {
	ll x , y;
	extended_GCD(a , mod , x , y);
	if (x < 0) x += mod;
	return x;
}


///////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////
void online_judge()
{
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
	freopen("error.txt", "w", stderr);
#endif
}
void ISO()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	//online_judge();

	//cerr << "Time elapsed: " << clock() / 1000 << " ms" << endl;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////

void solve()
{
	int k;
	cin >> k;
	string s;
	cin >> s;
	(s.length() <=k)?(cout << s <<"\n"):(cout << s.substr(0,k) <<"...\n");


}

int main()
{
	ISO();
	
	
	solve();
	return 0;
}

Measured memory_bytes: 3640