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

Q: Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'

A: 3
****
Q: Sentence: 'an airplane is being towed away from the jet bridge'. Find frequency of the letter 's'

A: 1
****
Q: Sentence: 'a man riding a skateboard up the side of a ramp'. Find frequency of the letter 'u'

A:
1
****