#include<stdio.h>
#include<string.h>
char *s,sir[1000005];
long int i,lung[1000005],ls,l,r,sol;
int main()
{
	FILE *f,*g;f=fopen("pscpld.in","r");g=fopen("pscpld.out","w");
	s=&sir[0];fscanf(f,"%s",s);ls=strlen(s);
	for(i=0;i<ls;i++)
	{ if(lung[i])sol=sol+(lung[i]+1)/2;
	  else
	  { lung[i]=1;l=i;r=i;
	    while(l-1>=0&&r+1<ls&&s[l-1]==s[r+1])
	     { lung[i]+=2;l--;r++;lung[r]=lung[l];}
	    sol=sol+(lung[i]+1)/2;
	  }
	}
	for(i=0;i<ls;i++)lung[i]=0;
	for(i=0;i<ls;i++)
	if(s[i]==s[i+1])
	{ if(lung[i])sol=sol+lung[i]/2;
	  else
	  { l=i;r=i+1;lung[i]=2;
	    while(l-1>=0&&r+1<ls&&s[l-1]==s[r+1])
	    { lung[i]+=2;l--;r++;lung[r]=lung[l];}
	    sol=sol+lung[i]/2;
	  }
	}
	fprintf(g,"%ld\n",sol);
	return 0;
}