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

Sentence: 'the skateboarder is jumping over a huge statue of a shoe'. Find frequency of the letter 'i'
2

Sentence: 'a golden haired dog looking out of an open window'. Find frequency of the letter 'd'
4

Sentence: 'a bunch of people are out in the water with their surfboards'. Find frequency of the letter 's'

2