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

[Q]: Sentence: 'three people are gathered around sitting on a park bench'. Find frequency of the letter 'g'
[A]: 2


[Q]: Sentence: 'man in a sleeping bag on the floor using a laptop computer'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'a teenager enjoying snowboarding down a hill on a cold day'. Find frequency of the letter 'l'
[A]:
3