instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a commuter bus in england by a clock tower building'. Find frequency of the letter 'w'
answer:
1


question:
Sentence: 'tow birds flying by a long necked crane'. Find frequency of the letter 'f'
answer:
1


question:
Sentence: 'a desktop computer on top of a wooden desk'. Find frequency of the letter 'n'
answer:

2