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

Ex Input:
Echocardiography demonstrates in clear, graphic fashion the _ cardiac chambers and four valves.

Ex Output:
four


Ex Input:
Every drug has _ names, a chemical name, a brand name, and an official name.

Ex Output:
three


Ex Input:
Lip prints are identified in _ different ways based on the wrinkles and grooves on the lip.

Ex Output:

six