#include<stdio.h>
#include<string.h>
char *s,sir[2000005];
long int L,sol,i,lung[2000005],j,ls;
int main()
{
	FILE *f,*g;f=fopen("pscpld.in","r");g=fopen("pscpld.out","w");
	sir[0]='#';
	s=&sir[1];fscanf(f,"%s",s);
	L=strlen(s);
	for(i=L-1;i>=0;i--){ s[2*i+2]=' ';s[2*i+1]=s[i];}
	s[0]=' ';
	L=2*L;s[L+1]='*';
	for(i=1;i<L;i++)
	{ while(s[i+lung[i]+1]==s[i-lung[i]-1])lung[i]++;
	  for(j=1;j<=lung[i];j++)
	  { ls=lung[i-j];
	    if(ls>lung[i]-j)ls=lung[i]-j;
	    if(lung[i+j]<ls)lung[i+j]=ls;
	  }
	  sol=sol+(lung[i]+i%2)/2;
	}
	fprintf(g,"%ld\n",sol);
	return 0;
}