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

[Q]: Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
[A]: 3


[Q]: Sentence: 'a man standing on a surf board in the ocean'. Find frequency of the letter 'f'
[A]: 1


[Q]: Sentence: 'a small fruit is sitting on a cutting board next to scissors'. Find frequency of the letter 'o'
[A]:
4