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

Q: Sentence: 'two computers and a laptop set up on a desk'. Find frequency of the letter 'r'

A: 1
****
Q: Sentence: 'a small boat travels on the water next to the shore'. Find frequency of the letter 'a'

A: 5
****
Q: Sentence: 'a man that is sitting in a car holding a cat'. Find frequency of the letter 'a'

A:
7
****