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

Input: Consider Input: Sentence: 'a crowd of people standing in front of a green train'. Find frequency of the letter 'g'

Output: 2


Input: Consider Input: Sentence: 'a large grass pasture land with sheep grazing on grass'. Find frequency of the letter 'a'

Output: 7


Input: Consider Input: Sentence: 'a parking sign and meter stand in front of a store front'. Find frequency of the letter 'g'

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Output: 2


