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

[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 pizza is in a box on a table outside'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'a large white bathroom with a very big shower'. Find frequency of the letter 'e'
[EX A]:
4