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

[Q]: Sentence: 'four men standing around two pizzas in a conference room'. Find frequency of the letter 't'
[A]: 2


[Q]: Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
[A]: 5


[Q]: Sentence: 'a passenger bus that has been parked in a lot'. Find frequency of the letter 't'
[A]:
3