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

Ex Input:
Scientists use a characteristic to classify animals into _ groups.

Ex Output:
two


Ex Input:
Black women giving birth have a four to _ higher rate of mortality than white women do.

Ex Output:
one


Ex Input:
Pakistani expatriates play an important role in the economies of the _ Arab Gulf countries.

Ex Output:

six