Самый простой вариант

field = []

[field.append(["."] * 8) for i in range(8)]

while 1:

       coord = list(map(int, input().split()))

       if 0 < coord[0] <= 8 and 0 < coord[1] <= 8:

               coord[0] -= 1

               coord[1] -= 1

               break

field[coord[0]][coord[1]] = "K"

moves = [[1, 2], [1, -2], [-1, 2], [-1, -2],

        [2, 1], [2, -1], [-2, 1], [-2, -1]]

for i in moves:

       try:

               if coord[0] + i[0] >= 0 and coord[1] + i[1] >= 0:

                       field[coord[0] + i[0]][coord[1] + i[1]] = "*"

       except:

               pass

for i in field:

       print(*i)