// (c) KreatoR '97
// travelling through the time, moving slowly in the sand
// knowledge is the weapon against the hunger in the land
#include <stdio.h>
void main()
{
	char niz[80+1],*tmp=niz;
	int duz=0;

	for(;(*tmp=getchar())!='\n';tmp++,duz++);
	*(tmp+1)='\0';
	printf("%s",niz);
	for(;duz>=0;tmp--,duz--) putchar(*tmp);
}