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:
Sponges have ____ main tissue layers.

Ex Output:
three


Ex Input:
Most children start primary school at ____ years of age.

Ex Output:
five


Ex Input:
Some species live in the water as nymphs for ____ years before they hatch into their adult stage.

Ex Output:

three