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

[Q]: Sentence: 'a couple of men standing inside of a liquor store'. Find frequency of the letter 'p'
[A]: 1

[Q]: Sentence: 'a woman holds a wine glass upside down while wearing rabbit ears and staring at a bottle of wine'. Find frequency of the letter 'a'
[A]: 11

[Q]: Sentence: 'two women sitting at a table while on their laptops'. Find frequency of the letter 'm'
[A]:
1