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

Sentence: 'a person with some scissors over a bowl'. Find frequency of the letter 's'
6

Sentence: 'a crowd of people standing in front of a green train'. Find frequency of the letter 'g'
2

Sentence: 'a stuffed monkey with a cigarette and a stuffed animal with a bottle of alcohol'. Find frequency of the letter 'u'

2