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

[Q]: Sentence: 'man sitting on the side of a van playing the guitar'. Find frequency of the letter 'm'
[A]: 1


[Q]: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'
[A]: 3


[Q]: Sentence: 'the skier went down the ramp of fake snow'. Find frequency of the letter 'w'
[A]:
3