instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a small boat travels on the water next to the shore'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'a girl hitting a tennis ball on a court'. Find frequency of the letter 'l'
answer:
3


question:
Sentence: 'a giraffe sticking it's tongue out near a window'. Find frequency of the letter 'a'
answer:

4