int main()
{
	int a,b,c,d,e,f,g;
	scanf("%d",&a);
	if(a<100)
	{
		b=a%10;
		c=(int)(a/10);
		d=10*b+c;
		printf("%d\n",d);
	}
	else if(a>100&&a<1000)
	{
		b=(int)(a/100);
		c=(int)(a/10)-10*b;
		d=a-100*b-10*c;
		e=100*d+10*c+b;
		printf("%d",e);
	}
	else if(a>1000&&a<10000)
	{
		b=(int)(a/1000);
		c=((a%100)-(a%10))/10;
		d=((a%1000)-(a%100))/100;
		e=a%10;
        f=1000*e+100*c+10*d+b;
		printf("%d",f);
	}
	else
	{
		b=(int)(a/10000);
		c=((a%100)-(a%10))/10;
		d=((a%1000)-(a%100))/100;
        g=((a%10000)-(a%1000))/1000;
		e=a%10;
        f=10000*e+1000*c+100*d+10*g+b;
		printf("%d",f);
	}
	return 0;
}