TASK DEFINITION: In this task, given a sentence in the English language, your task is to convert it into English Tokens.
PROBLEM: After birth, the cub was immediately taken into the arms of its mother.

SOLUTION: After birth , the cub was immediately taken into the arms of its mother .

PROBLEM: The canton in the north east of Switzerland has an area is 173 km².

SOLUTION: The canton in the north east of Switzerland has an area is 173 km ² .

PROBLEM: IE's various versions accounted for 70 percent of the market in 2009; this has dropped to approximately 56 percent today.

SOLUTION:
IE 's various versions accounted for 70 percent of the market in 2009 ; this has dropped to approximately 56 percent today .