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

[Q]: Sentence: 'a toilet of some sort near a sink of some sort'. Find frequency of the letter 'o'
[A]: 7


[Q]: Sentence: 'two metal  benches on an empty train platform'. Find frequency of the letter 'n'
[A]: 4


[Q]: Sentence: 'three giraffe and a zebra in a fenced area'. Find frequency of the letter 'h'
[A]:
1