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

Q: Sentence: 'two men in black wet suits beside a white surfboard'. Find frequency of the letter 'e'

A: 5
****
Q: Sentence: 'a group of people seated in chairs together and facing the same direction, with one man holding a soccer ball in his hands'. Find frequency of the letter 'm'

A: 2
****
Q: Sentence: 'pedestrians are walking along a pavement with umbrellas'. Find frequency of the letter 's'

A:
3
****