Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Ex Input:
Sharks have ____ gill slits on each side of the head.

Ex Output:
five


Ex Input:
Food waste is transformed into soil-like humus in three to ____ days.

Ex Output:
seven


Ex Input:
Fertilizer is applied according to soil tests taken every three to ____ years.

Ex Output:

four