TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a black computer with a screen reading "press any key to begin."'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'two indian women in colorful garb standing barefoot with two indian men'. Find frequency of the letter 'd'

SOLUTION: 3

PROBLEM: Sentence: 'two baggage handlers loading luggage onto conveyor belt'. Find frequency of the letter 'l'

SOLUTION:
4