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

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

[EX Q]: Sentence: 'a person is performing a stunt on a snowboard'. Find frequency of the letter 'p'
[EX A]: 2

[EX Q]: Sentence: 'a tv and other electronics in a room with chairs'. Find frequency of the letter 't'
[EX A]:
4