Start to work on the Task10

Task10:
In the matrix (mxn) to find all local miimumy. Local imnimum - is an
element of the matrix, which is strictly less than all of its existing
elements neighbors.
For example in the matrix:
23  4 51 27
12 34 12 43
11 15 37 18

local minima are:
a [0] [1] =  4
a [2] [0] = 11