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

[EX Q]: Sentence: 'a bus is stopped in front of a graphic statue'. Find frequency of the letter 'e'
[EX A]: 2

[EX Q]: Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'
[EX A]: 5

[EX Q]: Sentence: 'there are four people sitting at a counter together'. Find frequency of the letter 'o'
[EX A]:
4