Frames

Senya decided to write an operating system. To start, he plans to write a subroutine that draws window frames.

The drawing field is a rectangle of $h \times w$ pixels. Rows are numbered from 1 to $h$ from top to bottom, and columns are numbered from 1 to $w$ from left to right.

The $n$ frames are drawn on the field one after another. The $i$-th frame is the border of a rectangle with opposite corners at $(r_{i,1}, c_{i,1})$ and $(r_{i,2}, c_{i,2})$.

The first line contains integers $h$, $w$, and $n$, the field size and the number of frames ($2 \le h, w \le 80$, $1 \le n \le 26$). Each of the next $n$ lines contains four integers $r_{i,1}$, $c_{i,1}$, $r_{i,2}$, and $c_{i,2}$ ($1 \le r_{i,1} < r_{i,2} \le h$, $1 \le c_{i,1} < c_{i,2} \le w$).

Print the image produced by the frames described in the input as $h$ rows of $w$ characters each. A pixel not used by any frame is printed as .. A pixel of the $i$-th frame is printed with the $i$-th Latin letter, so the first frame uses a, the second uses b, and so on.