String dataString is read from input. If dataString does not contain character $\text{'}f\text{'},$ then output "Character $\text{'}f\text{'}$ is not found." Otherwise, output:

"Last occurrence of character $\text{'}f\text{'}$ is at index $"$

the index of the last occurrence of $\text{'}f\text{'}$ in dataString

$"."$

End with a newline.

Ex: If the input is celery, then the output is:

Character $\text{'}f\text{'}$ is not found.

Ex: If the input is ruffing, then the output is:

Last occurrence of character $\text{'}f\text{'}$ is at index $3.$