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

Sentence: 'this marketplace has a lot of fresh fruit and vegetables'. Find frequency of the letter 'v'
1

Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'
3

Sentence: 'a tray full of muffins with a little sign on it'. Find frequency of the letter 't'

5