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.

Input: Consider Input: Soy products contain ____ known classes of anti-cancer agents, including phytoestrogens.

Output: five


Input: Consider Input: Most healthy men experience about three to ____ erections in their sleep each night.

Output: five


Input: Consider Input: Older adults can sometimes go for ____ years before molting.


Output: two