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

[Q]: Sentence: 'a person standing operating a cell phone in a room'. Find frequency of the letter 'n'
[A]: 6


[Q]: Sentence: 'two zebra stand near the wooden posts on a building'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'a bear walking in a grassy open field'. Find frequency of the letter 'p'
[A]:
1