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 and several white red and blue airplanes'. Find frequency of the letter 'u'

SOLUTION: 1

PROBLEM: Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'a brick red and yellow locomotive is on the tracks'. Find frequency of the letter 'b'

SOLUTION:
1