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

Sentence: 'a man on a skateboard going down a ramp while people are watching'. Find frequency of the letter 'w'
3

Sentence: 'two men with colorful ties are posing for a picture'. Find frequency of the letter 'r'
4

Sentence: 'a mostly white living room with colorful books on a shelf'. Find frequency of the letter 'b'

1