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

[Q]: Sentence: 'old double decker bus parked in a lot'. Find frequency of the letter 't'
[A]: 1


[Q]: Sentence: 'one man grabbing another at a table while laughing'. Find frequency of the letter 'n'
[A]: 5


[Q]: Sentence: 'a street sign on a brick wall, reads rue croix des petits champs'. Find frequency of the letter 't'
[A]:
4