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

Q: Sentence: 'a bunch of broken down trains sit in a yard'. Find frequency of the letter 'n'

A: 5
****
Q: Sentence: 'a stop sign next to houses with christmas lights'. Find frequency of the letter 's'

A: 7
****
Q: Sentence: 'a great shot of the ocean with surfers in the background'. Find frequency of the letter 'u'

A:
2
****