Move Robot.txt

int xGrid = input1;
        int yGrid = input2;
        String current[] = input3.split("-");
		int x = Integer.parseInt(current[0]);
		int y = Integer.parseInt(current[1]);
		char D = current[2].charAt(0); //Direction robot is facing
        String msg = input4; //contains series of M, L or R
		String error="";
		StringBuffer out = new StringBuffer();

		for(int i=0; i<msg.length();i++){
			if(msg.charAt(i) == 'M'){
				if(D == 'N'){
					y++;
				}
				else if(D == 'S'){
					y--;
				}
				else if(D == 'E'){
					x++;
				}
				else if(D == 'W'){
					x--;
				}

				if(x>xGrid){
					x--;
					error = "ER";
					break;
				}
				else if(x<0){
					x++;
					error = "ER";
					break;
				}
				if(y>yGrid){
					y--;
					error = "ER";
					break;
				}
				else if(y<0){
					y++;
					error = "ER";
					break;
				}
			}

			else if(msg.charAt(i) == 'L'){
				switch (D){ //switch on current position
					case 'N':
						D = 'W';
						break;
					case 'S':
						D = 'E';
						break;
					case 'E':
						D = 'N';
						break;
					case 'W':
						D = 'S';
						break;
				}
				
			}
			else if(msg.charAt(i) == 'R'){
				switch (D){ //switch on current position
					case 'N':
						D = 'E';
						break;
					case 'S':
						D = 'W';
						break;
					case 'E':
						D = 'S';
						break;
					case 'W':
						D = 'N';
						break;
				}
			}
		}
		System.out.println(x + " " + y + " " + D);
		out.append(Integer.toString(x) + "-" + Integer.toString(y) + "-" + Character.toString(D));
		if(error.length()>0){
			out.append("-" + error);
		}
			

		return out.toString();