
int main()
{	
int x,k,a,b,c,d;
scanf("%d",&x);
if(x>999)
k=4;
else
if(x>99)
k=3;
else
if(x>9)
k=2;
else
k=1;
switch(k)
{
case 1: d=x;
printf("%d\n",d);break;
case 2:c=x/10;
d=x-10*c;
printf("%d%d\n",d,c);break;
case 3: b=x/100;
c=(x-100*b)/10;
d=x-100*b-10*c;
printf("%d%d%d",d,c,b);break;
case 4: a=x/1000;
b=(x-1000*a)/100;
c=(x-1000*a-100*b)/10;
d=x-1000*a-100*b-10*c;
printf("%d%d%d%d\n",d,c,b,a);break;
}

	return 0;
}
