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

[Q]: Sentence: 'a bird in a tree looking up at branches'. Find frequency of the letter 'e'
[A]: 3


[Q]: Sentence: 'a woman in yellow dress standing next to a horse'. Find frequency of the letter 'l'
[A]: 2


[Q]: Sentence: 'a small plane parked next to a truck and two bicycles'. Find frequency of the letter 'c'
[A]:
3