int main()
{
	int i,k,x,a,b,c,d,e,x1,x2,x3,x4,x5;
	k=0;
	scanf("%d",&x);
	a=x/10000;
	b=(x%10000)/1000;
	c=(x%1000)/100;
	d=(x%100)/10;
	e=(x%10)/1;
	for(i=1;i<=10000;i=i*10)
	{
		if(x/i!=0)
	k=k+1;
	};
	if(k==5)
	{x5=10000*e+1000*d+100*c+10*b+a;
	printf("%d%d%d%d%d",e,d,c,b,a);}
	else if(k==4)
	{x4=1000*e+100*d+10*c+b;
	printf("%d%d%d%d",e,d,c,b);}
	else if(k==3)
	{x3=100*e+10*d+c;
	printf("%d%d%d",e,d,c);}
	else if(k==2)
	{x2=10*e+d;
	printf("%d%d",e,d);}
	else if(k==1)
	{x1=e;
	printf("%d",e);}
	else
		printf("0");
	return 0;
}