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

[EX Q]: Sentence: 'a woman at a table checking her cell phone'. Find frequency of the letter 'a'
[EX A]: 5

[EX Q]: Sentence: 'two people in a snowy place near a wooden fence'. Find frequency of the letter 'n'
[EX A]: 5

[EX Q]: Sentence: 'a plate with bread, meat and broccoli on it next to a bowl of chili'. Find frequency of the letter 't'
[EX A]:
6