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

Q: Sentence: 'a crowd of people standing in front of a green train'. Find frequency of the letter 'g'

A: 2
****
Q: Sentence: 'an airplane is being towed away from the jet bridge'. Find frequency of the letter 's'

A: 1
****
Q: Sentence: 'a hotdog and chili fries and a beer are shown'. Find frequency of the letter 'n'

A:
3
****