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

[Q]: Sentence: 'a picture of two computers on a table'. Find frequency of the letter 'r'
[A]: 2


[Q]: Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'
[A]: 3


[Q]: Sentence: 'view of a living room arrangement with yellow chair and couch'. Find frequency of the letter 'o'
[A]:
5