public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int [ ] disks = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    disks [ i ] = i + 1 ;
  }
  int now = 0 ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int x = sc . nextInt ( ) ;
    if ( x == now ) {
      continue ;
    }
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( disks [ j ] == x ) {
        disks [ j ] = now ;
        now = x ;
        break ;
      }
    }
  }
  StringBuilder sb = new StringBuilder ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    sb . append ( disks [ i ] ) . append ( "\n" ) ;
  }
  System . out . print ( sb ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int [ ] disks = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { disks [ i ] = i + 1 ; } int now = 0 ; for ( int i = 0 ; i < m ; i ++ ) { int x = sc . nextInt ( ) ; if ( x == now ) { continue ; } for ( int j = 0 ; j < n ; j ++ ) { if ( disks [ j ] == x ) { disks [ j ] = now ; now = x ; break ; } } } StringBuilder sb = new StringBuilder ( ) ; for ( int i = 0 ; i < n ; i ++ ) { sb . append ( disks [ i ] ) . append ( " \n " ) ; } System . out . print ( sb ) ; }
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