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

Sentence: 'man in a radio studio wearing a suit in front of a microphone'. Find frequency of the letter 't'
3

Sentence: 'there is a sandwich with a lot of meat cut in half'. Find frequency of the letter 'a'
5

Sentence: 'black and white photo of cars parked on the street'. Find frequency of the letter 'k'

2