Returning from a trip around the world on Christmas night, Santa Claus decided to pass his time by playing Tetris. You in the game Christmas Blocks will join him in this entertainment. A playing field of a certain size will be visible on the screen in front of you. From above, objects of a certain geometric shape will begin to appear, which will consist of their boxes. They will fall down. Using the control keys, you can move objects on the playing field to the right or left, as well as rotate them in space around its axis. You will need to build one single row from these objects. Thus, you will remove these items from the playing field and get points for it.