import java.util.*;

public class RedRoverValidator 
{
	public static void main(String[] args) throws Exception
	{
		Scanner scan = new Scanner(System.in);
		
		String path = scan.next();
		
		if (scan.hasNext())
		{
			throw new Exception("Too many strings!");
		}
		
		if (path.length() > 100)
		{
			throw new Exception("Path is too long at length " + path.length());
		}
		
		for (int i = 0; i < path.length(); i++)
		{
			char c = path.charAt(i);
			if (c != 'N' && c != 'E' && c != 'W' && c != 'S')
			{
				throw new Exception("Invalid character: " + c);
			}
		}	
System.exit(42);	
	}
}