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

[Q]: Sentence: 'a man working on a small laptop on a wooden table'. Find frequency of the letter 'l'
[A]: 4


[Q]: Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'
[A]: 3


[Q]: Sentence: 'the pancake breakfast is in the plate at the wooden table'. Find frequency of the letter 'h'
[A]:
3