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

[Q]: Sentence: 'a stop sign next to houses with christmas lights'. Find frequency of the letter 's'
[A]: 7


[Q]: Sentence: 'the man is holding a plastic sled with snow in it next to a child'. Find frequency of the letter 'g'
[A]: 1


[Q]: Sentence: 'a public bathroom with graffiti on the walls'. Find frequency of the letter 'c'
[A]:
1