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

Sentence: 'a plastic container next to a toilet on a wooden box'. Find frequency of the letter 'i'
3

Sentence: 'a picture of a toilet and toilet paper in a bathroom'. Find frequency of the letter 'o'
5

Sentence: 'a vase filled with sunflowers on a table'. Find frequency of the letter 'h'

1