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

[EX Q]: Sentence: 'cooked fish and green broccoli share a single white plate'. Find frequency of the letter 'c'
[EX A]: 3

[EX Q]: Sentence: 'a man flying through the air on a bicycle'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'a group of people on a boat next to a whale'. Find frequency of the letter 'o'
[EX A]:
6