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

[EX Q]: Sentence: 'a man holding a brown paper bag kite'. Find frequency of the letter 'b'
[EX A]: 2

[EX Q]: Sentence: 'a baby calf has a tag on its right ear'. Find frequency of the letter 'n'
[EX A]: 1

[EX Q]: Sentence: 'a man with a baseball bat that is on a field'. Find frequency of the letter 'm'
[EX A]:
1