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

[EX Q]: Sentence: 'a couple of buses parked on the side of the street'. Find frequency of the letter 'b'
[EX A]: 1

[EX Q]: Sentence: 'a plastic tray that has different foods inside of it'. Find frequency of the letter 't'
[EX A]: 6

[EX Q]: Sentence: 'a child, man and woman walking with their luggage and two dogs'. Find frequency of the letter 'a'
[EX A]:
7