TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man with a large grey and black beard and glasses and a tie'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'a truck with a camper sits parked in some vegetation'. Find frequency of the letter 's'

SOLUTION: 3

PROBLEM: Sentence: 'a hot dog with a drink next to it, on a table'. Find frequency of the letter 'h'

SOLUTION:
2