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 riding in a cart pulled by a horse'. Find frequency of the letter 'a'
[EX A]: 4

[EX Q]: Sentence: 'a person dressed all in black snowboarding down a slope'. Find frequency of the letter 'e'
[EX A]: 4

[EX Q]: Sentence: 'new pieces of black luggage are on a shelf'. Find frequency of the letter 'k'
[EX A]:
1