s: "The number 6.", n: 1, output: "The number 7."
s: "The number 6.", n: 13, output: "The number 6."
s: "Test with negatives: -1", n: 1, output: "Test with negatives: 0"
s: "Test without negatives: - 1", n: 1, output: "Test without negatives: - 2"
s: "1 2 3 4", n: 1, output: "2 2 3 4"
s: "1 2 3 4", i: 2, output: "1 3 3 4"