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

Sentence: 'a man holding a frisbee high into the air'. Find frequency of the letter 'a'
4

Sentence: 'a grapefruit, toast, coffee and other items are on a tray'. Find frequency of the letter 't'
6

Sentence: 'trees that have been painted orange and yellow are seen in the snow'. Find frequency of the letter 'h'

3