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 man swinging a bat while playing baseball'. Find frequency of the letter 'm'
1

Sentence: 'a couch, chair, dining room table and television sitting in a room'. Find frequency of the letter 'a'

5