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static void Main(string[] args)
{
int A, B, C, D;
Random rd = new Random(1);
bool mybool = false;
while (mybool == false)
{
A = rd.Next(10);
B = rd.Next(10);
C = rd.Next(10);
D = rd.Next(10);
int[] arr = new int[4] { A, B, C, D };
if ((arr[0] * 1000 + arr[1] * 100 + arr[2] * 10 + arr[3])*2 == arr[3] * 1000 + arr[2] * 100 + arr[1] * 10 + arr[0])
{
mybool = true;
Console.WriteLine("{0},{1},{2},{3}",A,B,C,D);
break;
}
}
Console.ReadKey();
}