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

Sentence: 'the large modern train is on the train track'. Find frequency of the letter 'm'
1

Sentence: 'an audience watches as a bird spreads its wings'. Find frequency of the letter 'd'
3

Sentence: 'two people in the grass flying kites on a clear day'. Find frequency of the letter 'e'

5