int main()
{
	int x,a,b,c,d,y;
	scanf("%d",&x);
	if (x>=1000)
	{
		a=x/1000;
		b=(x-1000*a)/100;
        c=(x-1000*a-100*b)/10;
		d=x-1000*a-100*b-10*c;
		y=d*1000+c*100+b*10+a;
        printf("%04d",y);
	}
	if(x>=100 && x<1000)
	{
		a=x/100;
        b=(x-100*a)/10;
        c=x-100*a-10*b;
		y=c*100+b*10+a;
		printf("%03d",y);
	}
    if(x>=10 && x<100)
	{
		a=x/10;
		b=x-a*10;
		y=b*10+a;
		printf("%02d",y);
	}
	if(x<10)
		printf("%d",x);
	return 0;
}
