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

[EX Q]: Sentence: 'a train on a train track going through a bunch of trees'. Find frequency of the letter 'u'
[EX A]: 2

[EX Q]: Sentence: 'a stuffed animal sitting on an empty bed'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'there are many giraffes in a fenced in area'. Find frequency of the letter 'n'
[EX A]:
4