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

[EX Q]: Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'
[EX A]: 6

[EX Q]: Sentence: 'a young man riding a skateboard near a forest'. Find frequency of the letter 'd'
[EX A]: 2

[EX Q]: Sentence: 'a group of people standing together in the snow, some holding skis'. Find frequency of the letter 'e'
[EX A]:
6