public static void main ( String [ ] args ) {
  FastScanner scan = new Main ( ) . new FastScanner ( ) ;
  ;
  int t = scan . nextInt ( ) ;
  int k = scan . nextInt ( ) ;
  boolean bl [ ] = new boolean [ t * k + 1 ] ;
  ArrayList < Integer > T = new ArrayList < Integer > ( ) ;
  for ( int i = 0 ;
  i < k ;
  ++ i ) {
    T . add ( scan . nextInt ( ) ) ;
    bl [ T . get ( i ) ] = true ;
  }
  for ( int i = 0 ;
  i < k ;
  ++ i ) {
    System . out . print ( T . get ( i ) + " " ) ;
    int count = 0 ;
    for ( int j = 1 ;
    j <= t * k + 1 ;
    ++ j ) {
      if ( count == t - 1 ) {
        break ;
      }
      if ( bl [ j ] == false ) {
        ++ count ;
        System . out . print ( j + " " ) ;
        bl [ j ] = true ;
      }
    }
    System . out . println ( ) ;
  }
}

public static void main ( String [ ] args ) { FastScanner scan = new Main ( ) . new FastScanner ( ) ; ; int t = scan . nextInt ( ) ; int k = scan . nextInt ( ) ; boolean bl [ ] = new boolean [ t * k + 1 ] ; ArrayList < Integer > T = new ArrayList < Integer > ( ) ; for ( int i = 0 ; i < k ; ++ i ) { T . add ( scan . nextInt ( ) ) ; bl [ T . get ( i ) ] = true ; } for ( int i = 0 ; i < k ; ++ i ) { System . out . print ( T . get ( i ) + " ▁ " ) ; int count = 0 ; for ( int j = 1 ; j <= t * k + 1 ; ++ j ) { if ( count == t - 1 ) { break ; } if ( bl [ j ] == false ) { ++ count ; System . out . print ( j + " ▁ " ) ; bl [ j ] = true ; } } System . out . println ( ) ; } }
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