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

Sentence: 'a social occasion of people are uncovered before the open day'. Find frequency of the letter 'c'
4

Sentence: 'the skateboarder has on red and black sneakers and is riding a skateboard'. Find frequency of the letter 'g'
1

Sentence: 'a south asian man holds up a cell phone in the middle of a group of men'. Find frequency of the letter 'i'

3