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

[Q]: Sentence: 'a few giraffes standing in a field looking around'. Find frequency of the letter 'e'
[A]: 3


[Q]: Sentence: 'some giraffes moving across a big grass field'. Find frequency of the letter 'e'
[A]: 3


[Q]: Sentence: 'a plate with a pizza on it topped with an egg'. Find frequency of the letter 'z'
[A]:
2