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

Q: Sentence: 'a group of people walking down a rain soaked street with umbrellas'. Find frequency of the letter 'w'

A: 3
****
Q: Sentence: 'an image of a cautionary construction sign'. Find frequency of the letter 'a'

A: 5
****
Q: Sentence: 'a grey building on butt street and a no stopping sign'. Find frequency of the letter 'u'

A:
2
****