public static void Main()
char[] charray = new char[7];
Console.WriteLine("Enter 7 unique alphabetic characters: ");
for (int i = 0; i < charray.Length; i++)
charray[i] = Convert.ToChar(Console.ReadLine());
for (int j = 1; j < charray.Length; j++)
if (charray[i] == charray2[j])
Console.WriteLine("Please enter a unique alphabetic character.");
Console.WriteLine(charray);