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

[Q]: Sentence: 'three young people goofing around; one of the guys has a football, the girl has a teddy bear'. Find frequency of the letter 'd'
[A]: 3

[Q]: Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'
[A]: 5

[Q]: Sentence: 'a couple of toothbrushes that are on a table'. Find frequency of the letter 'h'
[A]:
3