public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  H = sc . nextInt ( ) ;
  W = sc . nextInt ( ) ;
  N = sc . nextInt ( ) ;
  ArrayList < Integer > nums = new ArrayList < > ( ) ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    int a = sc . nextInt ( ) ;
    for ( int j = 0 ;
    j < a ;
    j ++ ) nums . add ( i ) ;
  }
  ans = new int [ H ] [ W ] ;
  for ( int n = 0 ;
  n < nums . size ( ) ;
  n ++ ) {
    snake ( n , nums . get ( n ) ) ;
  }
  for ( int i = 0 ;
  i < H ;
  i ++ ) {
    System . out . print ( ans [ i ] [ 0 ] ) ;
    for ( int j = 1 ;
    j < W ;
    j ++ ) System . out . print ( " " + ans [ i ] [ j ] ) ;
    System . out . print ( '\n' ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; H = sc . nextInt ( ) ; W = sc . nextInt ( ) ; N = sc . nextInt ( ) ; ArrayList < Integer > nums = new ArrayList < > ( ) ; for ( int i = 0 ; i < N ; i ++ ) { int a = sc . nextInt ( ) ; for ( int j = 0 ; j < a ; j ++ ) nums . add ( i ) ; } ans = new int [ H ] [ W ] ; for ( int n = 0 ; n < nums . size ( ) ; n ++ ) { snake ( n , nums . get ( n ) ) ; } for ( int i = 0 ; i < H ; i ++ ) { System . out . print ( ans [ i ] [ 0 ] ) ; for ( int j = 1 ; j < W ; j ++ ) System . out . print ( " ▁ " + ans [ i ] [ j ] ) ; System . out . print ( ' \n ' ) ; } }
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