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

Ex Input:
Sentence: 'a bus is driving on the street behind some cars'. Find frequency of the letter 'a'

Ex Output:
2


Ex Input:
Sentence: 'a woman with short, brown hair is looking into a circular mirror and holding a camera up to her cheek'. Find frequency of the letter 'e'

Ex Output:
4


Ex Input:
Sentence: 'a woman writing on a navy clear wall, in a room'. Find frequency of the letter 'a'

Ex Output:

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
7


