Canvas Cropping

Problem Description

Little A drew a picture on a rectangular canvas of height $h$ and width $w$. Because there is too much blank margin around the picture, Little A wants to crop the canvas and keep only the main part of the picture. Specifically, the canvas can be viewed as a character matrix of $h$ rows and $w$ columns, where every character has an ASCII code between $33$ and $126$ (visible characters). Little A keeps only the submatrix formed by rows $x_1$ to $x_2$ and columns $y_1$ to $y_2$.

Little A hands the canvas to you. Can you help him crop it?

Input Format

The first line contains two positive integers $h$ and $w$, the number of rows and columns of the canvas. The second line contains four positive integers $x_1, x_2, y_1, y_2$, the kept row and column boundaries. The following $h$ lines each contain a string of length $w$, the content of the canvas.

Output Format

Output $x_2 - x_1 + 1$ lines, each a string of length $y_2 - y_1 + 1$: the cropped canvas.

Sample Input

Sample Input 1

3 5
2 2 2 4
.....
.>_<.
.....

Sample Input 2

5 5
1 2 3 4
AbCdE
fGhIk
LmNoP
qRsTu
VwXyZ

Sample Output

Sample Output 1

>_<

Sample Output 2

Cd
hI

Sample Explanation

For sample 1, the canvas is $3$ rows and $5$ columns; the crop region is rows $2$ to $2$ and columns $2$ to $4$. This region contains only row $2$, which is the string .>_<.; taking its columns $2$ to $4$ gives the substring >_<. So the program outputs >_<.

Constraints

For all test points, $1 \le h, w \le 100$, $1 \le x_1 \le x_2 \le h$, $1 \le y_1 \le y_2 \le w$.