content: package v118;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.StringTokenizer;
  
  public class Elevator_UVa11834 {
  	
  	static final double EPS = 1e-9;
  	static final double sqrt2 = Math.sqrt(2);
  	
  	public static void main(String[] args) throws IOException {
  		
  		Scanner sc = new Scanner(System.in);
  		PrintWriter out = new PrintWriter(System.out);
  
  		while(true)
  		{
  			int l = sc.nextInt(), w = sc.nextInt(), r1 = sc.nextInt(), r2 = sc.nextInt();
  			
  			if(l == 0) break;
  			
  			if(r1 << 1 > l || r1 <<1 > w || r2 << 1 > l || r2 << 1 > w)
  				out.format("%c\n", 'N');
  			else
  			{
  				Point a = new Point(0, 0), b = new Point(l, w);
  				Vector v = new Vector(1.0 / sqrt2, 1.0 / sqrt2);
  				
  				Circle c1 = new Circle(a.translate(v.scale(r1 * sqrt2)), r1);
  				Circle c2 = new Circle(b.translate(v.scale(-r2 * sqrt2)), r2);
  				out.format("%c\n", c1.intersect(c2) ? 'N' : 'S');				
  			}
  		}
  		
  		out.flush();
  	}
  	
  	static class Point
  	{
  		double x, y;
  		
  		Point(double a, double b)
  		{
  			x = a; y = b;
  		}
  		
  		double dist2(Point p)
  		{
  			return (x - p.x) * (x - p.x) + (y -p.y) * (y -p.y);
  		}
  		
  		Point translate(Vector v)
  		{
  			return new Point(x + v.x, y + v.y);
  		}
  	}
  	
  	static class Vector
  	{
  		double x, y;
  		
  		Vector(Point p, Point q)
  		{
  			x = q.x - p.x;
  			y = q.y - p.y;
  		}
  		
  		Vector(double a, double b)
  		{
  			x = a; y = b;
  		}
  		
  		Vector scale(double s)
  		{
  			return new Vector(x * s, y * s);
  		}
  	}
  	
  	static class Circle
  	{
  		Point c;
  		double r;
  		
  		Circle(Point p, double k)
  		{
  			c = p;
  			r = k;
  		}
  		
  		boolean intersect(Circle cir)
  		{
  			return c.dist2(cir.c) + EPS < (r + cir.r) * (r + cir.r);
  		}
  	}
  
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
  
  		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
  
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
  		
  		public long nextLong() throws IOException {return Long.parseLong(next());}
  
  		public String nextLine() throws IOException {return br.readLine();}
  		
  		public double nextDouble() throws IOException
  		{
  			String x = next();
  			StringBuilder sb = new StringBuilder("0");
  			double res = 0, f = 1;
  			boolean dec = false, neg = false;
  			int start = 0;
  			if(x.charAt(0) == '-')
  			{
  				neg = true;
  				start++;
  			}
  			for(int i = start; i < x.length(); i++)
  				if(x.charAt(i) == '.')
  				{
  					res = Long.parseLong(sb.toString());
  					sb = new StringBuilder("0");
  					dec = true;
  				}
  				else
  				{
  					sb.append(x.charAt(i));
  					if(dec)
  						f *= 10;
  				}
  			res += Long.parseLong(sb.toString()) / f;
  			return res * (neg?-1:1);
  		}
  		
  		public boolean ready() throws IOException {return br.ready();}
  
  
  	}
  }
  