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

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

A: 3
****
Q: Sentence: 'an old woman is holding her cat in front of a camera'. Find frequency of the letter 'r'

A: 3
****
Q: Sentence: 'a bunch of oranges at a produce center'. Find frequency of the letter 'n'

A:
3
****