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

[EX Q]: Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'
[EX A]: 3

[EX Q]: Sentence: 'a couple is cutting in to a cake at a wedding'. Find frequency of the letter 'd'
[EX A]: 2

[EX Q]: Sentence: 'a few stoplights that are in front of a building'. Find frequency of the letter 't'
[EX A]:
5