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

Sentence: 'a man is taking a picture of a man and woman'. Find frequency of the letter 'a'
8

Sentence: 'a bunch of cows that are in the field'. Find frequency of the letter 'a'
3

Sentence: 'a pair of black handled scicors sitting closed position'. Find frequency of the letter 'c'

4