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

Sentence: 'an old glass vase containing flowers on a glass table'. Find frequency of the letter 'b'
1

Sentence: 'surfboard being displayed in stor window with clothes behind it'. Find frequency of the letter 't'
4

Sentence: 'a black cat lying in an empty suitcase peers out over the edge of the suitcase'. Find frequency of the letter 't'
7