int main()
{
int a,b,c,d,e;
scanf("%d",&a);
     if(a>9999)
printf("00001");
     else if(a>999)
{b=a/1000;
c=(a-b*1000)/100;
d=(a-b*1000-c*100)/10;
e=(a-b*1000-c*100-d*10);
printf("%d%d%d%d",e,d,c,b);}
     else if(a>99)
{b=a/100;
c=(a-b*100)/10;
d=(a-b*100-c*10);
printf("%d%d%d",d,c,b);}
     else if(a>9)
{b=a/10;
c=(a-b*10);
printf("%d%d",c,b);}
     else
printf("%d",a);
return 0;
}