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

Q: Sentence: 'bathroom scene with a black cat going behind the door'. Find frequency of the letter 'e'

A: 4
****
Q: Sentence: 'a crowd of people skiing and enjoying the snow'. Find frequency of the letter 'o'

A: 5
****
Q: Sentence: 'a refrigerator and a mattress sitting outside of a residence'. Find frequency of the letter 'a'

A:
6
****