Description

A rectangular array is composed of digits $0$ to $9$. Digits $1$ to $9$ represent cells. A cell is defined as a group of adjacent cell digits (up, down, left, or right) that are considered part of the same cell. Find the number of cells in the given rectangular array. For example:
Array:

4 10
0234500067
1034560500
2045600671
0000000089

Input Format

The first line contains two integers: the number of rows $n$ ($1\leq n\leq 100$) and columns $m$ ($1\leq m\leq 100$).
The following lines contain an $n \times m$ matrix.

Output Format

The number of cells.

Sample

4 10
0234500067
1034560500
2045600671
0000000089

4