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

Sentence: 'a little child looking up to a camera holding a cell phone'. Find frequency of the letter 'g'
2

Sentence: 'a man in a sweatshirt is taking his own picture'. Find frequency of the letter 'u'
1

Sentence: 'a person wearing a tshirt is cutting a piece of paper using scissors'. Find frequency of the letter 'n'

4