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

[Q]: Sentence: 'a tennis player that is running to get the tennis ball'. Find frequency of the letter 't'
[A]: 7


[Q]: Sentence: 'an audience watches as a bird spreads its wings'. Find frequency of the letter 'd'
[A]: 3


[Q]: Sentence: 'a wedding party, including the bride, dressed for the event'. Find frequency of the letter 'w'
[A]:
1