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

Q: Sentence: 'a person riding a surfboard in the middle of a wave'. Find frequency of the letter 'o'

A: 3
****
Q: Sentence: 'this is an image of a woman playing tennis'. Find frequency of the letter 'f'

A: 1
****
Q: Sentence: 'small boats are on the clear ripply water'. Find frequency of the letter 's'

A:
2
****