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

[EX Q]: Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'
[EX A]: 5

[EX Q]: Sentence: 'a man walking a large elephant down a dirt road'. Find frequency of the letter 'g'
[EX A]: 2

[EX Q]: Sentence: 'a woman holding two cellphones to her ear simultaneously'. Find frequency of the letter 'n'
[EX A]:
4