task: Дойди до конца ряда и закрась только клетки с точками. Точки каждый раз в других местах.

+---+---+---+---+---+---+---+---+
| >       .   .       .       . |
+---+---+---+---+---+---+---+---+

+---+---+---+---+---+---+---+---+---+---+
| >   .           .               .     |
+---+---+---+---+---+---+---+---+---+---+

+---+---+---+---+---+---+
| >   .   .   .       . |
+---+---+---+---+---+---+

+---+---+---+---+---+---+---+---+---+---+---+
| >           .           .   .           . |
+---+---+---+---+---+---+---+---+---+---+---+
