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

[EX Q]: Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'
[EX A]: 5

[EX Q]: Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'
[EX A]: 3

[EX Q]: Sentence: 'a cat that is standing next to an open suitcase'. Find frequency of the letter 'e'
[EX A]:
3