Console.WriteLine(string.Join(",",Console.ReadLine()!.ToArray()));
using System;
class Program
{
static void Main()
{
Console.WriteLine(string.Join(",",Console.ReadLine()!.ToArray()));
}
}
System.Console.Write("Введите натуральное число: ");
int num = Convert.ToInt32(Console.ReadLine());
for (int count = 1; count < num; num--)
System.Console.Write(num + ", ");
System.Console.Write(num);