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

Sentence: 'a little boy sitting on a bed in a bedroom'. Find frequency of the letter 'e'
3

Sentence: 'a man riding his skateboard down low as he turns'. Find frequency of the letter 'g'
1

Sentence: 'a young person at bat in a baseball game'. Find frequency of the letter 'g'

2