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

[Q]: Sentence: 'a snow filled mountain with a guy with ski's'. Find frequency of the letter 'f'
[A]: 1


[Q]: Sentence: 'a young girl skiing down a snowy mountain'. Find frequency of the letter 'l'
[A]: 1


[Q]: Sentence: 'spectators watch male tennis player leap for a play'. Find frequency of the letter 'o'
[A]:
2