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

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

[EX Q]: Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'
[EX A]: 5

[EX Q]: Sentence: 'a person walking down a sidewalk holding a brown bag'. Find frequency of the letter 'l'
[EX A]:
3