TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man riding a skateboard up the side of a ramp'. Find frequency of the letter 'u'

SOLUTION: 1

PROBLEM: Sentence: 'a picture of two computers on a table'. Find frequency of the letter 'r'

SOLUTION: 2

PROBLEM: Sentence: 'an airplane is just about to complete it's full take off'. Find frequency of the letter 't'

SOLUTION:
6