Console.Write("Enter string 1: ");

string? string1 = Console.ReadLine();

Console.Write("Enter string 2: ");

string? string2 = Console.ReadLine();

if (string1 == null || string2 == null)
{
}
else if (string1.Length > string2.Length)
	Console.WriteLine(string1 + string2);
else if (string1.Length < string2.Length)
{
	string[] split = string2.Split(string1[0]);
	foreach (string value in split)
		Console.WriteLine(value);
}