int main()
{
	int x,y,a,b,c,d,e;
	scanf("%d",&x);
	a=x/10000;
	x=x%10000;
	b=x/1000;
	x=x%1000;
	c=x/100;
	x=x%100;
	d=x/10;
	x=x%10;
	e=x;
	if (a==0)
	{
		if(b==0)
		{
			if(c==0)
			{
				if(d==0)
				{
					y=e;
					printf("%d",y);
				}
				else
				{
					y=10*e+d;
					if(e==0)
						printf("0%d",y);
					else
						printf("%d",y);
				}

			}
			else
			{
				y=100*e+10*d+c;
				if(e==0)
				{
					if(d==0)
						printf("00%d",y);
					else
						printf("0%d",y);
				}
				else
					printf("%d",y);
			}

		}
		else
		{
			y=1000*e+100*d+10*c+b;
			if(e==0)
			{
				if(d==0)
				{
					if(c==0)
						printf("000%d",y);
					else
						printf("00%d",y);
				}
				else
					printf("0%d",y);
			}
			else
				printf("%d",y);
		}

	}
	else
	{
		y=10000*e+1000*d+100*c+10*b+a;
		if(e==0)
		{
			if(d==0)
			{
				if(c==0)
				{
					if(b==0)
						printf("0000%d",y);
					else
						printf("000%d",y);
				}
				else
					printf("00%d",y);
			}
			else
				printf("0%d",y);
		}
		else
			printf("%d",y);
	}

	return 0;
}