instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'decorated baseball cake in a clear plastic box'. Find frequency of the letter 'k'
answer:
1


question:
Sentence: 'a young boy bouncing a tennis ball on a tennis racquet'. Find frequency of the letter 'a'
answer:
5


question:
Sentence: 'two seagulls are flying through the blue sky'. Find frequency of the letter 't'
answer:

3