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

[EX Q]: Sentence: 'man is snow gear and skis skiing in the snow'. Find frequency of the letter 'i'
[EX A]: 5

[EX Q]: Sentence: 'a parking meter painted green with a sign that describes it as not a parking meter'. Find frequency of the letter 's'
[EX A]: 4

[EX Q]: Sentence: 'a mother and daughter sitting at a table with a small pink flower covered cake'. Find frequency of the letter 'e'
[EX A]:
7