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

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

[EX Q]: Sentence: 'a person dressed all in black snowboarding down a slope'. Find frequency of the letter 'e'
[EX A]: 4

[EX Q]: Sentence: 'a pile of stuffed animals hanging from the ceiling of a store'. Find frequency of the letter 'i'
[EX A]:
5