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

[EX Q]: Sentence: 'men are riding on motorcycles with a man riding in their carriers'. Find frequency of the letter 'r'
[EX A]: 8

[EX Q]: Sentence: 'a small wrinkley dog wearing a bow tie'. Find frequency of the letter 'e'
[EX A]: 3

[EX Q]: Sentence: 'a white toilet with a person leaving over it'. Find frequency of the letter 't'
[EX A]:
5