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

[EX Q]: Sentence: 'a social occasion of people are uncovered before the open day'. Find frequency of the letter 'c'
[EX A]: 4

[EX Q]: Sentence: 'a man in a suit makes the first slice into a cake'. Find frequency of the letter 't'
[EX A]: 4

[EX Q]: Sentence: 'a man dressed in a banana suit holding a banana'. Find frequency of the letter 'n'
[EX A]:
7