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

Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'
3

Sentence: 'a bathroom with a sink, counter top, and mirror is shown'. Find frequency of the letter 'i'
4

Sentence: 'slices of orange are arranged on a plate'. Find frequency of the letter 's'

2