TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a mixed bouquet of flowers in a glass vase set before a window'. Find frequency of the letter 'w'

SOLUTION: 3

PROBLEM: Sentence: 'a river with a long dragon boat in it and rowers on the boat in sets of two, along with two other people'. Find frequency of the letter 'h'

SOLUTION: 4

PROBLEM: Sentence: 'an airplane is flying in the sky on a cloudy day'. Find frequency of the letter 's'

SOLUTION:
2