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

Ex Input:
Monarch caterpillars have _ pairs of tentacles.

Ex Output:
two


Ex Input:
Walruses walk with _ flippers over ice and snow.

Ex Output:
four


Ex Input:
Most infants double their birth weight in _ months and triple it in a year.

Ex Output:

six