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

[Q]: Sentence: 'a tv in a glass mirror in the bathroom'. Find frequency of the letter 'h'
[A]: 2


[Q]: Sentence: 'some food on plates next to each other on a table'. Find frequency of the letter 'e'
[A]: 6


[Q]: Sentence: 'several planes on the ground and hanging from the ceiling in an airplane museum'. Find frequency of the letter 'n'
[A]:
10