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

Sentence: 'a person with some scissors over a bowl'. Find frequency of the letter 's'
6

Sentence: 'a little boy sitting on a bed in a bedroom'. Find frequency of the letter 'e'
3

Sentence: 'a bus with two floors belonging to london country'. Find frequency of the letter 't'

4