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

Q: Sentence: 'a small white plane sitting on top of the ocean'. Find frequency of the letter 'e'

A: 4
****
Q: Sentence: 'an audience watches as a bird spreads its wings'. Find frequency of the letter 'd'

A: 3
****
Q: Sentence: 'a taxi and three buses next to a building'. Find frequency of the letter 'i'

A:
3
****