TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two women standing next to each other holding tennis rackets'. Find frequency of the letter 't'

SOLUTION: 7

PROBLEM: Sentence: 'an commercial airline airplane flies above the clouds'. Find frequency of the letter 'n'

SOLUTION: 3

PROBLEM: Sentence: 'black and white photo of a toothbrush in a mug and a pair of glasses'. Find frequency of the letter 'l'

SOLUTION:
2