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

Q: Sentence: 'a piece of meat covered in ketchup next to a hamburger on a green plate'. Find frequency of the letter 'g'

A: 2
****
Q: Sentence: 'a man hitting a tennis ball with a tennis racquet'. Find frequency of the letter 't'

A: 6
****
Q: Sentence: 'altered photograph of a snow boarder in flight'. Find frequency of the letter 'r'

A:
4
****