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public class Squeezer
{
	public static void main(String[] args) throws Exception
	{
		BufferedReader r = new BufferedReader(
			new FileReader("filename"));
		int array[]=new int[100];
		for (int i=0;i<array.length;i++)
			array[i]=Integer.MIN_VALUE;
		String line;
		int ct=0;
		while ( (line = r.readLine()) != null)
			array[ct++]=Integer.parseInt(line);
		for(int i=0;i<ct;)
			if (array[i] == 0)
				for(int j=i;j<ct;j++)
					array[j]=array[j+1];
			else
				i++;
		for(int i=0;array[i]!=Integer.MIN_VALUE;i++)
			System.out.println(array[i]);
	}
}