In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Ex Input:
Men produce brand new sperm every _ to three months.

Ex Output:
two


Ex Input:
Cancer can start in any of the _ sections or where the colon ends in the rectum.

Ex Output:
four


Ex Input:
Mercury fillings are illegal in _ European countries.

Ex Output:

three