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

[EX Q]: Sentence: 'a person standing operating a cell phone in a room'. Find frequency of the letter 'n'
[EX A]: 6

[EX Q]: Sentence: 'the skateboarder is jumping over a huge statue of a shoe'. Find frequency of the letter 'i'
[EX A]: 2

[EX Q]: Sentence: 'an upright clock near wooden tables and chairs'. Find frequency of the letter 'n'
[EX A]:
4