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

Q: Sentence: 'a gourmet looking hamburger with fries on a dining table with some wine'. Find frequency of the letter 't'

A: 4
****
Q: Sentence: 'many white birds flying above a river that flows in front of a forest'. Find frequency of the letter 'a'

A: 5
****
Q: Sentence: 'over two dozen donuts that have a sugar coating on them, placed together on a white tray with blue designs'. Find frequency of the letter 'r'

A:
4
****