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

Q: Sentence: 'cars parked outside if a retail store'. Find frequency of the letter 'd'

A: 2
****
Q: Sentence: 'children with scissors and construction paper in a school classroom'. Find frequency of the letter 'c'

A: 6
****
Q: Sentence: 'a subway train is stopped with its doors open'. Find frequency of the letter 'u'

A:
1
****