instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'three young people goofing around; one of the guys has a football, the girl has a teddy bear'. Find frequency of the letter 'd'
answer:
3


question:
Sentence: 'a yellow and green train on a train track in a wooded area'. Find frequency of the letter 'o'
answer:
4


question:
Sentence: 'a bird has landed on the scarecrow who doesn't have a head'. Find frequency of the letter 'o'
answer:

4