In this task, given a sentence in the English language, your task is to convert it into English Tokens.

Ex Input:
Mandushev went on to say, "Because of the planet's relatively weak pull on its upper atmosphere, some of the atmosphere probably escapes in a comet-like tail."

Ex Output:
Mandushev went on to say , `` Because of the planet 's relatively weak pull on its upper atmosphere , some of the atmosphere probably escapes in a comet-like tail . ''


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

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


Ex Input:
"We’re actively investigating the cause and are working to take the appropriate steps to remedy the situation as rapidly as possible."

Ex Output:

`` We 're actively investigating the cause and are working to take the appropriate steps to remedy the situation as rapidly as possible . ''