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

Ex Input:
Skin cancer affects one in _ people in the United States over a lifetime.

Ex Output:
six

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

Ex Output:
two

Ex Input:
Flu strikes within one to _ days after exposure to the virus.

Ex Output:
three