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

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

A: 5
****
Q: Sentence: 'a photo of a small boat on a shore'. Find frequency of the letter 'f'

A: 1
****
Q: Sentence: 'a large clock on the corner of the sidewalk near a tree'. Find frequency of the letter 'f'

A:
1
****