instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'tow birds flying by a long necked crane'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'a blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'
answer:
2


question:
Sentence: 'zebras and antelopes mull around a plain in africa'. Find frequency of the letter 'r'
answer:

3