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: 'a number of small boats on a beach near an umbrella'. Find frequency of the letter 's'
[EX A]: 2

[EX Q]: Sentence: 'a black and white cat drinking water out of a bowl'. Find frequency of the letter 'e'
[EX A]:
2