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

Q: Sentence: 'a photo of a toilet which is not clean'. Find frequency of the letter 'w'

A: 1
****
Q: Sentence: 'a lady mixes some things in a blender as people look on'. Find frequency of the letter 'i'

A: 3
****
Q: Sentence: 'pedestrians pass by a stop sign, some holding surfboards'. Find frequency of the letter 'n'

A:
3
****