static void Main()
{
Console.WriteLine("Enter any integer: ");
var read = Console.ReadLine();
var referrer = new string(read.ToCharArray().OrderBy(i => i).ToArray());
var input = read.ToCharArray().Select(x => int.Parse(x.ToString())).ToList();
var first = int.Parse(read);
var last = int.Parse(string.Join("", input.OrderByDescending(i => i).ToArray()));
var permutations = Enumerable.Range(first, last).ToList();
var container = new List<int>();
foreach (var item in permutations)
{
var reference = new string(item.ToString().ToCharArray().OrderBy(i => i).ToArray());
int c = string.Compare(referrer, reference);
if (c != 0) continue;
container.Add(int.Parse(item.ToString()));
}
var inputNumberIndex = container.IndexOf(int.Parse(read));
if (inputNumberIndex >= 0)
{
if (container.Count == 0) Console.WriteLine(container.FirstOrDefault());
var findIndex = inputNumberIndex + 1;
Console.WriteLine(container[findIndex]);
}
else
{
Console.WriteLine("-1");
}
Console.ReadKey();
}
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