In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Ex Input:
Natural iron contains _ isotopes and isomers.

Ex Output:
four


Ex Input:
Snow is made from snowflakes, which are _ sided.

Ex Output:
six


Ex Input:
Money is _ less a medium of exchange in foreign trade than it is in domestic trade.

Ex Output:

no