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

[EX Q]: Sentence: 'seagulls sit on the posts of a seaside balcony by a clock tower'. Find frequency of the letter 'g'
[EX A]: 1

[EX Q]: Sentence: 'there is a stop sign that has a reflection in a puddle'. Find frequency of the letter 'e'
[EX A]: 5

[EX Q]: Sentence: 'red and green apples and oranges in protective packaging'. Find frequency of the letter 'n'
[EX A]:
6