public static void main ( String [ ] args ) throws IOException {
  FastReader scn = new FastReader ( ) ;
  Print pr = new Print ( ) ;
  int n = scn . nextInt ( ) , k = scn . nextInt ( ) ;
  String s = scn . next ( ) ;
  int [ ] lps = new int [ n ] ;
  computeLPSArray ( s , n , lps ) ;
  int t = n - lps [ n - 1 ] ;
  String temp = s . substring ( lps [ n - 1 ] ) ;
  for ( int i = 1 ;
  i < k ;
  i ++ ) {
    s += temp ;
  }
  System . out . println ( s ) ;
}

public static void main ( String [ ] args ) throws IOException { FastReader scn = new FastReader ( ) ; Print pr = new Print ( ) ; int n = scn . nextInt ( ) , k = scn . nextInt ( ) ; String s = scn . next ( ) ; int [ ] lps = new int [ n ] ; computeLPSArray ( s , n , lps ) ; int t = n - lps [ n - 1 ] ; String temp = s . substring ( lps [ n - 1 ] ) ; for ( int i = 1 ; i < k ; i ++ ) { s += temp ; } System . out . println ( s ) ; }
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