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

[EX Q]: Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'
[EX A]: 2

[EX Q]: Sentence: 'a train station with a train pulling into the platform'. Find frequency of the letter 'i'
[EX A]: 6

[EX Q]: Sentence: 'wooden boat tied up at a peer on a large body of water'. Find frequency of the letter 'n'
[EX A]:
2