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

[EX Q]: Sentence: 'a person riding a skate board on a city street'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'a guy riding a bike close to a car in the street'. Find frequency of the letter 'i'
[EX A]: 4

[EX Q]: Sentence: 'a group of boys and men stand next to a plow pulled by horses'. Find frequency of the letter 't'
[EX A]:
3