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

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

A: 3
****
Q: Sentence: 'a photo of a couple of people at a convention'. Find frequency of the letter 'v'

A: 1
****
Q: Sentence: 'a man is taking a picture at a mirror'. Find frequency of the letter 'g'

A:
1
****