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

[EX Q]: Sentence: 'two little girls playing with a bat and a tennis ball'. Find frequency of the letter 'w'
[EX A]: 2

[EX Q]: Sentence: 'a full plate of food that includes rice and broccoli and carrots'. Find frequency of the letter 's'
[EX A]: 2

[EX Q]: Sentence: 'a blue dumpster filled with dead rotten bananas'. Find frequency of the letter 'n'
[EX A]:
3