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

[Q]: Sentence: 'this marketplace has a lot of fresh fruit and vegetables'. Find frequency of the letter 'v'
[A]: 1


[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: 'adult black dog holding a fabric chew toy'. Find frequency of the letter 'e'
[A]:
1