#include <bits/stdc++.h>
using namespace std;
#define int long long
int n;
string s;
bool equals(int l1, int r1, int l2, int r2){
string s1 = "", s2 = "";
for (int i=l1; i<=r1; i++) s1 += s[i];
for (int i=l2; i<=r2; i++) s2 += s[i];
return s1==s2;
}
signed main(){
cin>>s;
n=(int)(s.length());
s=" "+s;
int ans=0;
for (int i=1; i<=(n+1)/2; i++){
int r=i;
while (r<=n-i+1 and equals(i,r,n-r+1,n-i+1)==false){
r++;
}
//cout<<"I "<<i<<' '<<r<<'\n';
ans+=2;
if (i==n-r+1 and r==n-i+1) ans--;
i=r;
}
cout<<ans<<'\n';
}
