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

Example Input: Most cats have only _ to five toes per paw, depending on whether it is the front or back paw.
Example Output: four

Example Input: Most women have _ problems getting pregnant with a retroverted uterus.
Example Output: no

Example Input: Carbon has six protons and _ electrons.
Example Output:
six