In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a couple of men sitting next to each other under an umbrella'. Find frequency of the letter 'n'

Answer: 5


Question: Sentence: 'a bed with a dog laying on it next to two laptop computers'. Find frequency of the letter 'n'

Answer: 3


Question: Sentence: 'a bunch of people are gathered at a fruit and veggie stand'. Find frequency of the letter 'g'

Answer:
3