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

Sentence: 'a plane with smoke coming from the tips of both wings'. Find frequency of the letter 'c'
1

Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'
3

Sentence: 'two players holding racquets reach across the net to shake hands'. Find frequency of the letter 's'

6