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

Sentence: 'a pizza pie sitting on a wooden table with tongs'. Find frequency of the letter 't'
5

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

Sentence: 'a male professional tennis player is about to make a serve'. Find frequency of the letter 'l'

3