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

Q: Sentence: 'a silver train crossing the road on tracks'. Find frequency of the letter 'r'

A: 5
****
Q: Sentence: 'an airplane is being towed away from the jet bridge'. Find frequency of the letter 's'

A: 1
****
Q: Sentence: 'a cow that is laying down on a beach'. Find frequency of the letter 'a'

A:
5
****