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

[EX Q]: Sentence: 'a tennis player after hitting a shot back to the other side of the court'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'a teddy bear is sitting on a heart shaped patio chair outside'. Find frequency of the letter 'i'
[EX A]: 6

[EX Q]: Sentence: 'a desk with multiple computer screens forming one large screen'. Find frequency of the letter 'p'
[EX A]:
2