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

[EX Q]: Sentence: 'a piece of film shows two street signs crossing each other'. Find frequency of the letter 'f'
[EX A]: 2

[EX Q]: Sentence: 'a woman standing next to a man on a motorcycle in front of a market'. Find frequency of the letter 'l'
[EX A]: 1

[EX Q]: Sentence: 'a large bathroom with columns next to the tub'. Find frequency of the letter 'a'
[EX A]:
3