TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'

SOLUTION: 3

PROBLEM: Sentence: 'a large motorcycle that has a man dressed in old clothing next to it'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'a person walking with an open umbrella'. Find frequency of the letter 'h'

SOLUTION:
1