using System;
public class Program
{
public static void Main()
var e = Stage.C2;
switch(e)
case Stage.A1:
case Stage.A2:
case Stage.A3:
Console.Write("A");
break;
case Stage.B1:
case Stage.B2:
case Stage.B3:
Console.Write("B");
case Stage.C1:
case Stage.C2:
case Stage.C3:
Console.Write("C");
case Stage.D1:
case Stage.D2:
case Stage.D3:
Console.Write("D");
case Stage.E1:
case Stage.E2:
case Stage.E3:
Console.Write("E");
default:
Console.Write("default");
}
public enum Stage{
A1,
A2,
A3,
B1,
B2,
B3,
C1,
C2,
C3,
D1,
D2,
D3,
E1,
E2,
E3