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

[EX Q]: Sentence: 'an elephant with broken tusks stands in front of a hill and boulders'. Find frequency of the letter 'n'
[EX A]: 7

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

[EX Q]: Sentence: 'a man in a beanie is holding up a doughnut'. Find frequency of the letter 'h'
[EX A]:
2