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

[Q]: Sentence: 'a group of workers washing and cleaning fruits and vegetables'. Find frequency of the letter 'i'
[A]: 3


[Q]: Sentence: 'a man walking a large elephant down a dirt road'. Find frequency of the letter 'g'
[A]: 2


[Q]: Sentence: 'there are three people walking down a road carrying umbrellas'. Find frequency of the letter 'l'
[A]:
4