TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a young man with glasses on is taking a big bite'. Find frequency of the letter 's'

SOLUTION: 4

PROBLEM: Sentence: 'a grapefruit, toast, coffee and other items are on a tray'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'a cross walk with traffic cones at night'. Find frequency of the letter 'i'

SOLUTION:
3