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

[Q]: Sentence: 'a photo of a small boat on a shore'. Find frequency of the letter 'f'
[A]: 1


[Q]: Sentence: 'a kitchen with hanging lights, an island with sink and bar stools, a refrigerator, small pantry door, wooden cabinets and shiny wood floor'. Find frequency of the letter 'n'
[A]: 12


[Q]: Sentence: 'two big dogs play in the baby outdoor swimming pool'. Find frequency of the letter 'g'
[A]:
3