import java.io.IOException;
import java.io.OutputStream;

public class SerialWriter implements Runnable {
	
	OutputStream out;
	
	public SerialWriter(OutputStream out) {
		
		this.out = out;
	}
	
	public void run() {
		
		try {
			
			int c = 0;
			
			while ((c = System.in.read()) > -1) {
				
				if (c == 49) {
					this.out.write(1);
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}