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

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


[Q]: Sentence: 'city two way street with cars lined up on both sides'. Find frequency of the letter 'h'
[A]: 2


[Q]: Sentence: 'a man in blue shirt touching a cake with a utensil'. Find frequency of the letter 't'
[A]:
4