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

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'
2

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

Sentence: 'traffic on a road in winter with some snow on the ground'. Find frequency of the letter 'n'

6