Vocabulary consisting only from characters you are able to read
やる気
yaruki
willingness (e.g. to do something)/eagerness/motivation/inspiration/determination/high aspirationsjlpt3
中
naka
inside, middle, amongjlpt5
十億
juuoku
1,000,000,000, billion (American), (obs) milliard (British)mix
~階
~kai
(first, second, etc.) floor, story, gradejlpt5