def matrix(hei, wid):
     m = {}
     m["height"] = hei
     m["width"] = wid
     for lin in range(hei):
         for col in range(wid):
             m[lin, col] = 0
     return m


def show(mat):
     hei = mat["height"]
     wid = mat["width"]
     for lin in range(hei):
         for col in range(wid):
             print mat[lin, col],
         print