task: Поднимись по лестнице и закрась каждую ступеньку. Ступенек каждый раз разное число.

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

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

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

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