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

Ex Input:
Most smokers try to quit at least _ or six times before they succeed, researchers say.

Ex Output:
five

Ex Input:
Natural iron contains _ isotopes and isomers.

Ex Output:
four

Ex Input:
Drug eruptions can occur up to _ weeks after exposure to a drug usually an antibiotic.

Ex Output:
four