In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'a man riding a skateboard up the side of a ramp'. Find frequency of the letter 'u'

A: 1
****
Q: Sentence: 'a sheep in a field in front of other sheep'. Find frequency of the letter 'f'

A: 3
****
Q: Sentence: 'a woman riding a blue bike down a road'. Find frequency of the letter 'b'

A:
2
****