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:
Sapsuckers are a group of ____ species known for literally drinking the sap of trees.

Ex Output:
four

Ex Input:
Biological islands are of ____ general types, geographical and ecological.

Ex Output:
two

Ex Input:
Plaice reach maturity typically when they are between four and ____ years old.

Ex Output:
six