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

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

[EX Q]: Sentence: 'people waiting on a train platform in a wooded area'. Find frequency of the letter 'p'
[EX A]: 3

[EX Q]: Sentence: 'a poster sitting behind a light near a tv'. Find frequency of the letter 'd'
[EX A]:
1