TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'this yellow fire hydrant sits in a grass field'. Find frequency of the letter 'i'

SOLUTION: 5

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: 'two skateboarders going fast down an empty road'. Find frequency of the letter 'm'

SOLUTION:
1