#include<stdio.h>
#include<string.h>
char *s,sir[2000005];
long int L,sol,i,lung[2000005],pali[2000005],st,dr,mid;
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(dr=1;dr<=L;dr++)
	{ if(pali[dr])
	  { mid=pali[dr];st=2*mid-dr;
	    if(mid-lung[mid]<=st-lung[st])lung[dr]=lung[st];
	    else lung[dr]=st+lung[mid]-mid;
	  }
	  while(s[dr+lung[dr]+1]==s[dr-lung[dr]-1])
	  { lung[dr]++;pali[dr+lung[dr]]=dr;}
	  sol=sol+(lung[dr]+dr%2)/2;
	}
	fprintf(g,"%ld\n",sol);
	return 0;
}