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

[EX Q]: Sentence: 'food sitting in bowls on table with checked tablecloth'. Find frequency of the letter 't'
[EX A]: 6

[EX Q]: Sentence: 'an image of a street sign with a corner restaurant'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'the stop sign at electric avenue has an "all war" sign beneath it'. Find frequency of the letter 'a'
[EX A]:
7