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

Sentence: 'a group of men standing around a table cutting a cake'. Find frequency of the letter 'g'
3

Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
5

Sentence: 'a person attached to a parachute gliding through the sky'. Find frequency of the letter 'h'
5