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

Q: Sentence: 'a group of cars and house on truck passing in a street'. Find frequency of the letter 'i'

A: 2
****
Q: Sentence: 'this yellow fire hydrant sits in a grass field'. Find frequency of the letter 'i'

A: 5
****
Q: Sentence: 'a black dog laying on its side on a couch'. Find frequency of the letter 'c'

A:
3
****