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

[Q]: Sentence: 'a man holding a brown paper bag kite'. Find frequency of the letter 'b'
[A]: 2

[Q]: Sentence: 'city two way street with cars lined up on both sides'. Find frequency of the letter 'h'
[A]: 2

[Q]: Sentence: 'a woman sitting in front of a giant slice of cheese pizza'. Find frequency of the letter 'e'
[A]:
4