using System;
public class Test
{
public static void Main()
{
var sortedWorkCodes = "BEPFGHJNOUSTQM";
var i = sortedWorkCodes.IndexOf("F");
switch (i)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
Console.WriteLine(0);
break;
case 7:
case 8:
case 9:
case 10:
case 11:
Console.WriteLine(1);
break;
case 12:
case 13:
Console.WriteLine(2);
break;
default:
Console.WriteLine(-1);
break;
}
}
}
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