TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a truck is parked in front of a store'. Find frequency of the letter 't'

SOLUTION: 3

PROBLEM: Sentence: 'a couple of girls are hanging out at a restaurant'. Find frequency of the letter 'l'

SOLUTION: 2

PROBLEM: Sentence: 'a parking sign and meter stand in front of a store front'. Find frequency of the letter 'g'

SOLUTION:
2