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

Sentence: 'a glass vase sits between two statues'. Find frequency of the letter 'o'
1

Sentence: 'a double decker bus with a lot of people on board'. Find frequency of the letter 'l'
3

Sentence: 'a toddler has a teddy bear tied to her back'. Find frequency of the letter 't'

4