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

[Q]: Sentence: 'a plastic container next to a toilet on a wooden box'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'
[A]: 2


[Q]: Sentence: 'a black tray with various plants and flowers in it'. Find frequency of the letter 't'
[A]:
4