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

Sentence: 'food sitting in bowls on table with checked tablecloth'. Find frequency of the letter 't'
6

Sentence: 'tow birds flying by a long necked crane'. Find frequency of the letter 'f'
1

Sentence: 'a picture of a machine built next to a street'. Find frequency of the letter 'x'
1