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

Q: Sentence: 'a guy riding a bike close to a car in the street'. Find frequency of the letter 'i'

A: 4
****
Q: Sentence: 'small airplane in the process of taking off'. Find frequency of the letter 'e'

A: 3
****
Q: Sentence: 'there is a man playing a game of tennis'. Find frequency of the letter 'm'

A:
2
****