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

Q: Sentence: 'a grey hummingbird by fence and tree branches'. Find frequency of the letter 'y'

A: 2
****
Q: Sentence: 'a person does a trick on a ramp on a snowboard'. Find frequency of the letter 's'

A: 3
****
Q: Sentence: 'three zebra's in a fenced in area with two walking away and one facing the camera'. Find frequency of the letter 'i'

A:
5
****