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

Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'
2

Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'
2

Sentence: 'a man in costume talking on a cell phone'. Find frequency of the letter 'm'

2