import java.util.Set;
import java.util.HashSet;
 
public class Main
{
    public static void main(String[] args)
    {
        Set<String> strings = new HashSet<String>();
 
        strings.add("val1");
        strings.add("val2");
        strings.add("val3");
 
        String str = "Val";
 
        if (strings.contains(str.toLowerCase()))
        {
            System.out.println("yes");
        }
        else
        {
            System.out.println("no");
        }
    }
}

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