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

Q: Sentence: 'a blue train on a track next to another track'. Find frequency of the letter 'c'

A: 2
****
Q: Sentence: 'a small white plane sitting on top of the ocean'. Find frequency of the letter 'e'

A: 4
****
Q: Sentence: 'a notebook a pen and an alarm clock'. Find frequency of the letter 'd'

A:
1
****