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

[Q]: Sentence: 'a family out snow skiing on a blustery day'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'a variety of a different type of vegetables'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'a man sitting on top of a motorcycle'. Find frequency of the letter 'e'
[A]:
1