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