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

Sentence: 'one woman is arranging the other woman's hair'. Find frequency of the letter 'o'
4

Sentence: 'two elephants facing each other touching trunks in an enclosure'. Find frequency of the letter 'f'
1

Sentence: 'a small herd of sheep grazing in a grassy field'. Find frequency of the letter 'l'

3