B'Fillomino is a classic logic puzzle. (You do not need to know Fillomino in order to solve this problem.) In one classroom in Yunqi town, some volunteers are playing a board game variant of it: Consider an n by n chessboard. Its rows are numbered from 1 to n from the top to the bottom. Its columns are numbered from 1 to n from the left to the right. A cell on an intersection of x -th row and y -th column is denoted (x, y) . The main diagonal of the chessboard is cells (x, x) for all 1 <= x <= n . A permutation of {1, 2, 3, ... , n } is written on the main diagonal of the chessboard. There is exactly one number written on each of the cells. The problem is to partition the cells under and on the main diagonal (there are exactly 1+2+ ldots +n such cells) into n connected regions satisfying the following constraints: The first line contains a single integer n ( 1 <= n <= 500 ) denoting the size of the chessboard. The second line contains n integers p_1 , p_2 , ..., p_n . p_i is the number written on cell (i, i) . It is guaranteed that each integer from {1, ldots, n } appears exactly once in p_1 , ..., p_n . If no solution exists, output -1 . Otherwise, output n lines. The i -th line should contain i numbers. The j -th number on the i -th line should be x if cell (i, j) belongs to the the region with x cells. The solutions to the examples are illustrated in the following pictures: '...