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

[EX Q]: Sentence: 'a baby calf has a tag on its right ear'. Find frequency of the letter 'n'
[EX A]: 1

[EX Q]: Sentence: 'this is a close up view of a tennis player during the game'. Find frequency of the letter 't'
[EX A]: 3

[EX Q]: Sentence: 'a boy doing a skateboard trick on a park bench'. Find frequency of the letter 'e'
[EX A]:
2