Description

Output the lower triangular part of a matrix.
The lower triangular part of a matrix consists of the first $1$ number in the first row, the first $2$ numbers in the second row, and the first $n$ numbers in the $n$-th row.

Input Format

First line contains the size of the matrix $n$.
Lines $2$ to $n+1$ contain the matrix elements ($1 \le n \le 100$, $1 \le$ all numbers $\le 1000$).

Output Format

Output $n$ lines.
First line contains the first number of the matrix.
Second line contains the first $2$ numbers of the matrix.
... ...
$n$-th line contains the first $n$ numbers of the matrix.

Sample

4
1 2 4 3
3 4 5 6
6 4 7 9
9 3 4 5

1
3 4
6 4 7
9 3 4 5