void main()
{
	int a,b,c,d,e,f,g,h,i,j;
	scanf("%d",&a);
	b=a%10;
	c=(a%100-b)/10;
	d=(a%1000-10*c-b)/100;
	e=(a%10000-100*d-10*c-b)/1000;
	f=(a%100000-1000*e-100*d-10*c-b)/10000;
	g=10000*b+1000*c+100*d+10*e+f;
	h=1000*b+100*c+10*d+e;
	i=100*b+10*c+d;
	j=10*b+c;
	if(a>10000)
	{printf("%d\n",g);}
	else if(a>1000)
	{printf("%d\n",h);}
	else if(a>100)
	{printf("%d\n",i);}
	else if(a>10)
	{printf("%d\n",j);}
	else
	{printf("%d\n",a);}
}