TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a social occasion of people are uncovered before the open day'. Find frequency of the letter 'c'

SOLUTION: 4

PROBLEM: Sentence: 'the wooden kitchen has a small child's plastic table in it'. Find frequency of the letter 'n'

SOLUTION: 3

PROBLEM: Sentence: 'this is an image of a baseball player catching a fly ball'. Find frequency of the letter 'l'

SOLUTION:
6