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

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


[Q]: Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'
[A]: 3


[Q]: Sentence: 'a group of people some holding umbrellas some not'. Find frequency of the letter 't'
[A]:
1