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

[EX Q]: Sentence: 'the meal is served and ready to be eaten'. Find frequency of the letter 'e'
[EX A]: 8

[EX Q]: Sentence: 'a herd of horses standing next to each other on a field'. Find frequency of the letter 'r'
[EX A]: 3

[EX Q]: Sentence: 'a person is jet skiing in the water'. Find frequency of the letter 'o'
[EX A]:
1