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

Ex Input:
Conserved residues make similar contacts in _ repressor-operator complexes.

Ex Output:
two


Ex Input:
Tobacco kills four million people a year, one death every _ seconds.

Ex Output:
eight


Ex Input:
Calves are weaned when they are about _ to eight months old.

Ex Output:

seven