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

Ex Input:
Climatic regions Contrasts between the interior and the coasts produce _ main climatic regions.

Ex Output:
six


Ex Input:
Bacteriophage lambda has _ different life cycles.

Ex Output:
two


Ex Input:
Neutrinos are particles with almost _ mass and no electric charge.

Ex Output:

no