TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'oranges are sitting in a bowl on a table'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'one man grabbing another at a table while laughing'. Find frequency of the letter 'n'

SOLUTION: 5

PROBLEM: Sentence: 'a jumbo jet airliner carrying a space shuttle through the air'. Find frequency of the letter 'u'

SOLUTION:
3