public static void Main() {
Console.WriteLine("'=' : " + a);
Console.WriteLine("'+=' : " + x);
Console.WriteLine("'+=' : " + y);
Console.WriteLine("'*=' : " + z);
Console.WriteLine("'/=' : " + a);
Console.WriteLine("'%=' : " + b);
Console.WriteLine("'&=' : " + a);
Console.WriteLine("'|=' : " + b);
Console.WriteLine("'^=' : " + b);
Console.WriteLine("'<<=' : " + b);
Console.WriteLine("'>>=' : " + b);