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

[EX Q]: Sentence: 'the counter of a doctor's office, including a laptop, cotton swabs, and tongue depressors'. Find frequency of the letter 'g'
[EX A]: 2

[EX Q]: Sentence: 'a little boy standing near a couch and a table'. Find frequency of the letter 'i'
[EX A]: 2

[EX Q]: Sentence: 'a person is standing in front of a hotel holding an umbrella'. Find frequency of the letter 'r'
[EX A]:
3