
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.util.StringTokenizer;


         class FastReader
        {
            BufferedReader br;
            StringTokenizer st;

            public FastReader()
            {
                br = new BufferedReader(new
                        InputStreamReader(System.in));
            }

            String next()
            {
                while (st == null || !st.hasMoreElements())
                {
                    try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    }
                }
                return st.nextToken();
            }

            int nextInt()
            {
                return Integer.parseInt(next());
            }

            long nextLong()
            {
                return Long.parseLong(next());
            }

            double nextDouble()
            {
                return Double.parseDouble(next());
            }

            String nextLine()
            {
                String str = "";
                try
                {
                    str = br.readLine();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                return str;
            }
        }

public class Main {

    public static void main(String[] args) {
        FastReader fastReader = new FastReader();
        filter( fastReader.nextInt(), fastReader.next() );

    }

    private static void filter(int reach, String s) {

        int len = s.length();
        if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        }

    }
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util class FastReader
        {
            BufferedReader br;
            StringTokenizer st;

            public FastReader()
            {
                br = new BufferedReader(new
                        InputStreamReader(System.in));
            }

            String next()
            {
                while (st == null || !st.hasMoreElements())
                {
                    try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    }
                }
                return st.nextToken();
            }

            int nextInt()
            {
                return Integer.parseInt(next());
            }

            long nextLong()
            {
                return Long.parseLong(next());
            }

            double nextDouble()
            {
                return Double.parseDouble(next());
            }

            String nextLine()
            {
                String str = "";
                try
                {
                    str = br.readLine();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                return str;
            }
        } FastReader BufferedReader br; br StringTokenizer st; st public FastReader()
            {
                br = new BufferedReader(new
                        InputStreamReader(System.in));
            } FastReader {
                br = new BufferedReader(new
                        InputStreamReader(System.in));
            } br = new BufferedReader(new
                        InputStreamReader(System.in)) br new BufferedReader(new
                        InputStreamReader(System.in)) String next()
            {
                while (st == null || !st.hasMoreElements())
                {
                    try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    }
                }
                return st.nextToken();
            } next {
                while (st == null || !st.hasMoreElements())
                {
                    try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    }
                }
                return st.nextToken();
            } while (st == null || !st.hasMoreElements())
                {
                    try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    }
                } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
                    try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    }
                } try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    } catch (IOException  e)
                    {
                        e.printStackTrace();
                    } IOException  e {
                        e.printStackTrace();
                    } e.printStackTrace() e.printStackTrace e {
                        st = new StringTokenizer(br.readLine());
                    } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt()
            {
                return Integer.parseInt(next());
            } nextInt {
                return Integer.parseInt(next());
            } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong()
            {
                return Long.parseLong(next());
            } nextLong {
                return Long.parseLong(next());
            } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble()
            {
                return Double.parseDouble(next());
            } nextDouble {
                return Double.parseDouble(next());
            } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine()
            {
                String str = "";
                try
                {
                    str = br.readLine();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                return str;
            } nextLine {
                String str = "";
                try
                {
                    str = br.readLine();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                return str;
            } String str = ""; str "" try
                {
                    str = br.readLine();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                } catch (IOException e)
                {
                    e.printStackTrace();
                } IOException e {
                    e.printStackTrace();
                } e.printStackTrace() e.printStackTrace e {
                    str = br.readLine();
                } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main {

    public static void main(String[] args) {
        FastReader fastReader = new FastReader();
        filter( fastReader.nextInt(), fastReader.next() );

    }

    private static void filter(int reach, String s) {

        int len = s.length();
        if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        }

    }
} Main public static void main(String[] args) {
        FastReader fastReader = new FastReader();
        filter( fastReader.nextInt(), fastReader.next() );

    } main {
        FastReader fastReader = new FastReader();
        filter( fastReader.nextInt(), fastReader.next() );

    } FastReader fastReader = new FastReader(); fastReader new FastReader() filter( fastReader.nextInt(), fastReader.next() ) filter fastReader.nextInt() fastReader.nextInt fastReader fastReader.next() fastReader.next fastReader String[] args args private static void filter(int reach, String s) {

        int len = s.length();
        if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        }

    } filter {

        int len = s.length();
        if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        }

    } int len = s.length(); len s.length() s.length s if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        } len <= reach len reach {
            System.out.println(s);
        } System.out.println(s) System.out.println System.out System System.out s {
            System.out.println( s.substring(0, reach ) + "..." );
        } System.out.println( s.substring(0, reach ) + "..." ) System.out.println System.out System System.out s.substring(0, reach ) + "..." s.substring(0, reach ) s.substring s 0 reach "..." int reach reach String s s public class Main {

    public static void main(String[] args) {
        FastReader fastReader = new FastReader();
        filter( fastReader.nextInt(), fastReader.next() );

    }

    private static void filter(int reach, String s) {

        int len = s.length();
        if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        }

    }
} public class Main {

    public static void main(String[] args) {
        FastReader fastReader = new FastReader();
        filter( fastReader.nextInt(), fastReader.next() );

    }

    private static void filter(int reach, String s) {

        int len = s.length();
        if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        }

    }
} Main

    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.util.StringTokenizer;


         class FastReader
        {
            BufferedReader br;
            StringTokenizer st;

            public FastReader()
            {
                br = new BufferedReader(new
                        InputStreamReader(System.in));
            }

            String next()
            {
                while (st == null || !st.hasMoreElements())
                {
                    try
                    {
                        st = new StringTokenizer(br.readLine());
                    }
                    catch (IOException  e)
                    {
                        e.printStackTrace();
                    }
                }
                return st.nextToken();
            }

            int nextInt()
            {
                return Integer.parseInt(next());
            }

            long nextLong()
            {
                return Long.parseLong(next());
            }

            double nextDouble()
            {
                return Double.parseDouble(next());
            }

            String nextLine()
            {
                String str = "";
                try
                {
                    str = br.readLine();
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
                return str;
            }
        }

public class Main {

    public static void main(String[] args) {
        FastReader fastReader = new FastReader();
        filter( fastReader.nextInt(), fastReader.next() );

    }

    private static void filter(int reach, String s) {

        int len = s.length();
        if( len <= reach ){
            System.out.println(s);
        }else{
            System.out.println( s.substring(0, reach ) + "..." );
        }

    }
}
