import java.io.InputStream; import java.io.PrintWriter; import java.util.Iterator; import java.util.PrimitiveIterator; import java.util.Scanner; import java.util.stream.Collectors; import java.util.stream.IntStream; import java.util.stream.Stream; class Main_Util{ private void solve(){ System.out.println(strs(gInt()).collect(Collectors.joining())); } public static void main(String[]$){ new Main_Util().solve(); System.out.flush(); } static class System{ private static final InputStream in=java.lang.System.in; private static final PrintWriter out=new PrintWriter(java.lang.System.out,false); } static Scanner s=new Scanner(System.in); static int gInt(){ return s.nextInt(); } static long gLong(){ return s.nextLong(); } static long gDouble(){ return s.nextLong(); } static Range rep(int i){ return new Range(i); } static Range rep(int f,int t){ return new Range(f,t); } static class Range implements Iterable,PrimitiveIterator.OfInt{ int from,to,c; Range(int from,int to){ this.from=from; this.to=to; this.c=from; } Range(int n){ this(0,n-1); } @Override public Iterator iterator(){ return this; } @Override public boolean hasNext(){ return c<=to; } @Override public int nextInt(){ return c++; } } static IntStream REPS(int v){ return IntStream.range(0,v); } static IntStream REPS(int l,int r){ return IntStream.rangeClosed(l,r); } static IntStream ints(int n){ return REPS(n).map(i->gInt()); } static Stream strs(int n){ return REPS(n).mapToObj(i->s.next()); } }