public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int H = sc . nextInt ( ) , W = sc . nextInt ( ) ;
  int n = sc . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) a [ i ] = sc . nextInt ( ) ;
  int [ ] [ ] ans = new int [ H ] [ W ] ;
  int row = 0 , col = 0 ;
  int flag = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int cnt = a [ i ] ;
    for ( int j = 0 ;
    j < cnt ;
    j ++ ) {
      if ( col == - 1 || col == W ) {
        col = col == - 1 ? 0 : W - 1 ;
        row ++ ;
        flag = flag * ( - 1 ) ;
      }
      ans [ row ] [ col ] = i + 1 ;
      col += flag ;
    }
  }
  for ( int i = 0 ;
  i < H ;
  i ++ ) {
    for ( int j = 0 ;
    j < W - 1 ;
    j ++ ) {
      System . out . print ( Integer . toString ( ans [ i ] [ j ] ) + " " ) ;
    }
    System . out . println ( ans [ i ] [ W - 1 ] ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int H = sc . nextInt ( ) , W = sc . nextInt ( ) ; int n = sc . nextInt ( ) ; int [ ] a = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) a [ i ] = sc . nextInt ( ) ; int [ ] [ ] ans = new int [ H ] [ W ] ; int row = 0 , col = 0 ; int flag = 1 ; for ( int i = 0 ; i < n ; i ++ ) { int cnt = a [ i ] ; for ( int j = 0 ; j < cnt ; j ++ ) { if ( col == - 1 || col == W ) { col = col == - 1 ? 0 : W - 1 ; row ++ ; flag = flag * ( - 1 ) ; } ans [ row ] [ col ] = i + 1 ; col += flag ; } } for ( int i = 0 ; i < H ; i ++ ) { for ( int j = 0 ; j < W - 1 ; j ++ ) { System . out . print ( Integer . toString ( ans [ i ] [ j ] ) + " ▁ " ) ; } System . out . println ( ans [ i ] [ W - 1 ] ) ; } }
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