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

[Q]: Sentence: 'a person trying to flip a skateboard in a garage'. Find frequency of the letter 'a'
[A]: 7


[Q]: Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'
[A]: 3


[Q]: Sentence: 'a young tyke swings at the ball which is mid air, not far from his baseball bat'. Find frequency of the letter 'e'
[A]:
3