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:
Photons have ____ mass and no electrical charge.

Ex Output:
no

Ex Input:
Metamorphosis takes over ____ months and the froglets come out really small.

Ex Output:
five

Ex Input:
Most skink species have short legs that are well-formed and a few have ____ legs at all.

Ex Output:
no