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 jet flying through the clear blue sky'. Find frequency of the letter 'g'
answer:
2


question:
Sentence: 'surfer airborne on his board on the top of a wave'. Find frequency of the letter 'h'
answer:

2