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

Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'
5

Sentence: 'a commuter bus in england by a clock tower building'. Find frequency of the letter 'w'
1

Sentence: 'a dog sitting on a couch with various blankets and throw pillows'. Find frequency of the letter 'i'

5