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

[Q]: Sentence: 'there is a woman pointing at something with her dog'. Find frequency of the letter 'i'
[A]: 5


[Q]: Sentence: 'a plastic tray that has different foods inside of it'. Find frequency of the letter 't'
[A]: 6


[Q]: Sentence: 'smiling people enjoying an ethnic asian meal together'. Find frequency of the letter 'm'
[A]:
2