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

[EX Q]: Sentence: 'the interior of a living and dining room'. Find frequency of the letter 'i'
[EX A]: 6

[EX Q]: Sentence: 'the snowboarder wearing a dark helmet sprays snow into the air'. Find frequency of the letter 'w'
[EX A]: 3

[EX Q]: Sentence: 'a skateboarder jumps very high at a skate park'. Find frequency of the letter 't'
[EX A]:
3