In this task, you need to count the number of times the given letter appears in the given sentence.

[EX Q]: Sentence: 'a glass a rope and a pair of scissors'. Find frequency of the letter 's'
[EX A]: 6

[EX Q]: Sentence: 'a man in a suit makes the first slice into a cake'. Find frequency of the letter 't'
[EX A]: 4

[EX Q]: Sentence: 'a blue and white street sign and two traffic lights and buildings'. Find frequency of the letter 'b'
[EX A]:
2