Nzec ? what the problem here?

this is my first program but always i get NZEC

this is the code :

public class Main{
	public static String egypt(int x, int y ,int z){
		if(x>0 && y>0 && z>0 && x<30000 && y<30000 && z<30000){
			if(Math.pow(x,2)+Math.pow(y,2)==Math.pow(z,2)){
				return "right";
			}
			else{
				return "wrong";
			}
		}
		else{
			return "wrong";
		}
	}
	public static void main (String[] args) throws java.lang.Exception{
		java.io.BufferedReader sc = new java.io.BufferedReader (new java.io.InputStreamReader (System.in));
		String r = sc.readLine();
		while(!r.equals("0 0 0")){
			int x = Integer.parseInt(r.substring(0,r.indexOf(" ")));
			r = r.substring(r.indexOf(" ")+1);
			int y = Integer.parseInt(r.substring(0,r.indexOf(" ")));
			r = r.substring(r.indexOf(" ")+1);
			int z = Integer.parseInt(r);
			System.out.println (egypt(x,y,z));
			r= sc.readLine();
		}
	}
}