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

[EX Q]: Sentence: 'a couple is cutting in to a cake at a wedding'. Find frequency of the letter 'd'
[EX A]: 2

[EX Q]: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'
[EX A]: 3

[EX Q]: Sentence: 'man in red shirt with black suitcase standing outside of building'. Find frequency of the letter 'i'
[EX A]:
8