In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'a few men walking through a market place'. Find frequency of the letter 'f'

A: 1
****
Q: Sentence: 'this yellow fire hydrant sits in a grass field'. Find frequency of the letter 'i'

A: 5
****
Q: Sentence: 'a guy on skateboard is jumping over a rail'. Find frequency of the letter 's'

A:
2
****