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

[Q]: Sentence: 'a castle like bed room that has the era of templar knight similarities'. Find frequency of the letter 'm'
[A]: 3


[Q]: Sentence: 'different sets of luggage in a baggage claim area'. Find frequency of the letter 'r'
[A]: 2


[Q]: Sentence: 'a biker bar with motorcycles parked in front of it'. Find frequency of the letter 'a'
[A]:
3


