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

Q: Sentence: 'two men are playing a video game as another sits watching'. Find frequency of the letter 'a'

A: 7
****
Q: Sentence: 'group of cars on the road with the sun setting behind it'. Find frequency of the letter 'd'

A: 2
****
Q: Sentence: 'an eighteen wheeler is on the freeway going fast'. Find frequency of the letter 'r'

A:
2
****