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

Ex Input:
Essential oils have a non-toxic, residual effect of up to five months from just _ application.

Ex Output:
one

Ex Input:
Most polyps cause no symptoms and take five to _ years to change to cancer.

Ex Output:
seven

Ex Input:
Secondary aluminum uses _ percent of the energy required to produce primary aluminum.

Ex Output:
five