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

[EX Q]: Sentence: 'a dog sitting in the back of a truck flat bed'. Find frequency of the letter 'h'
[EX A]: 1

[EX Q]: Sentence: 'pedestrians pass by a stop sign, some holding surfboards'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'the woman is putting stuff into the refrigerator that is full of green cans'. Find frequency of the letter 'i'
[EX A]:
5