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

[EX Q]: Sentence: 'a person is performing a stunt on a snowboard'. Find frequency of the letter 'p'
[EX A]: 2

[EX Q]: Sentence: 'the child is waving a small flag as she stands near two women'. Find frequency of the letter 'g'
[EX A]: 2

[EX Q]: Sentence: 'a baseball player walks in the outfield of a baseball field'. Find frequency of the letter 'e'
[EX A]:
6