import java.util.*;

public class Check
{

	public static void printError(int line, String msg)
	{
		System.out.println("ERROR Line " + line + ": " + msg);
		System.exit(-1);
	}

	public static void main(String [] args)
	{
		Scanner in = new Scanner(System.in);
		String line;

		line = in.next();
		for(int i=0; i<line.length(); i++) {
			char ch = line.charAt(i);
			if (ch != 'N' && ch != 'S' && ch != 'E' && ch != 'W')
				printError(1, "Illegal character in points string");
		}
		if (in.hasNext())
			printError(2, "extraneous data at end of file");
System.exit(42);
	}
}