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

[EX Q]: Sentence: 'a bird is standing on the ledge of the building'. Find frequency of the letter 't'
[EX A]: 3

[EX Q]: Sentence: 'the miniature, elaborate exhibit depicts an ancient boating scene'. Find frequency of the letter 'n'
[EX A]: 6

[EX Q]: Sentence: 'a holder for a cell phone made of yarn'. Find frequency of the letter 'e'
[EX A]:
4