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

[EX Q]: Sentence: 'a close up of a bird on the outside window sill'. Find frequency of the letter 'c'
[EX A]: 1

[EX Q]: Sentence: 'a man with glasses adjusting his tie in a mirror'. Find frequency of the letter 's'
[EX A]: 5

[EX Q]: Sentence: 'the young woman is licking the long hotdog'. Find frequency of the letter 'g'
[EX A]:
4