int main()
{
	int n,a1,a2,b1,b2,c1,c2,d1;
	scanf("%d",&n);
	a1=n%10;
	a2=n/10;
	if(a2>0)
	{
		b1=a2%10;
	    b2=a2/10;
		if(b2>0)
		{
			  c1=b2%10;
		      c2=b2/10;
			  if(c2>0)
			  {
					d1=c2%10;
				     printf("%d%d%d%d",a1,b1,c1,d1);
			  }
			  else
				     printf("%d%d%d",a1,b1,c1);
		}
		else
			printf("%d%d",a1,b1);
	}
	else
	printf("%d",a1);
    return 0;
}