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

[EX Q]: Sentence: 'man in a sleeping bag on the floor using a laptop computer'. Find frequency of the letter 'i'
[EX A]: 3

[EX Q]: Sentence: 'a large group of motorcycles parked along a street'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'three people sit at a restaurant table drinking wine'. Find frequency of the letter 'h'
[EX A]:
1