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

Q: Sentence: 'a yellow and green train on a train track in a wooded area'. Find frequency of the letter 'o'

A: 4
****
Q: Sentence: 'a blue tripocal bird is perched on a wooden fence'. Find frequency of the letter 'd'

A: 3
****
Q: Sentence: 'a bunch of vegetables sprinkled with pepper sitting beside each other'. Find frequency of the letter 'e'

A:
10
****