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

Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'
5

Sentence: 'girls posing of a picture one holding a tennis racket the other wearing a crown'. Find frequency of the letter 'g'
4

Sentence: 'several decorated cakes spread out across a table'. Find frequency of the letter 'b'

1