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: 'a dog has found a rather large stick for playing fetch'. Find frequency of the letter 't'
[A]: 3


[Q]: Sentence: 'two ladies are trying to feed a giraffe'. Find frequency of the letter 't'
[A]:
3


