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

[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: 'vanity sitting atop a base with two doors and a mirror overhead'. Find frequency of the letter 'n'
[A]: 3


[Q]: Sentence: 'a couple of people sitting on a bench during a game'. Find frequency of the letter 'd'
[A]:
1