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

[Q]: Sentence: 'a man working on a small laptop on a wooden table'. Find frequency of the letter 'l'
[A]: 4


[Q]: Sentence: 'two zebras standing around while a third zebra drinks from a pond'. Find frequency of the letter 's'
[A]: 3


[Q]: Sentence: 'a small child in a gray hoodie eating a doughnut'. Find frequency of the letter 'o'
[A]:
3


