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

[EX Q]: Sentence: 'a man swinging a bat while playing baseball'. Find frequency of the letter 'm'
[EX A]: 1

[EX Q]: Sentence: 'there is a woman pointing at something with her dog'. Find frequency of the letter 'i'
[EX A]: 5

[EX Q]: Sentence: 'an asian man sitting at a desk on a laptop'. Find frequency of the letter 't'
[EX A]:
4