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

[Q]: Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'a girl sits on a surfboard and smiles'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'two old people sitting on a bench before a wooded lake'. Find frequency of the letter 'g'
[A]:
1