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

Sentence: 'soccer players on opposite teams fight for control over a ball'. Find frequency of the letter 't'
4

Sentence: 'two people in a snowy place near a wooden fence'. Find frequency of the letter 'n'
5

Sentence: 'person with cross-country skies and poles standing in the middle of a trail'. Find frequency of the letter 't'
5