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

Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'
3

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

Sentence: 'there is no image here to provide a caption for'. Find frequency of the letter 'o'

5