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

Sentence: 'a blue bowl holding mashed bananas and oatmeal with a bottle of sugar and cinnamon sitting beside it'. Find frequency of the letter 'g'
3

Sentence: 'a room with a big screen television and a couch'. Find frequency of the letter 'h'
2

Sentence: 'a dog by a bench in a park'. Find frequency of the letter 'n'

2