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

[EX Q]: Sentence: 'a man makes some cock tales at a desk'. Find frequency of the letter 'k'
[EX A]: 3

[EX Q]: Sentence: 'a bathroom with a sink, counter top, and mirror is shown'. Find frequency of the letter 'i'
[EX A]: 4

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