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

Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'
3

Sentence: 'a photo of a couple of people at a convention'. Find frequency of the letter 'v'
1

Sentence: 'that toilet looks very close to the ground'. Find frequency of the letter 'c'

1