ХЭШИ D

#include <iostream>
#include <cmath>
#include <vector>
#include <queue>
#include <algorithm>
#include <string>
#include <stack>
#include <set>
#include <map>
#define pii pair <int,int>
#define vec vector
using namespace std;
using ll = long long;
using ld = long double;
using db = double;
void cv(vector <int> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvl(vector <ll> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}


void cvv(vector <vector <int> > &v){
    for (auto x: v) cv(x);
    cout<<"\n";
}

void cvb(vector <bool> v){
    for (bool x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvs(vector <string>  v){
    for (auto a: v){
        cout<<a<<"\n";
    }
}

void cvp(vector <pii> a){
    for (auto p: a){
        cout<<p.first<<' '<<p.second<<"\n";
    }
    cout<<"\n";
}

ll mod=1e9+7, p  =101;
bool sh=0;

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string s; cin>>s;  int n = s.size();
    vector <ll> pf(n), powp(n,1);
    for (int i = 1; i < n; ++i) {
        powp[i] = powp[i - 1] * p % mod;
    }
    pf[0] = s[0] - 'a' + 1;
    for (int i = 1; i < n; ++i){
        pf[i] = pf[i - 1] + (s[i] - 'a' + 1) * powp[i];
        pf[i] %= mod;
    }
    if (sh){
        cout<<"s\n";
        cout<<s<<"\n";
        cout<<"pf\n";
        cvl(pf);
    }
    vector <int> ans;

    //отдельно проверить a = 0
    int b=0;

    for (int a = 1; a <= n; ++a){
        //if ((n - a - b) % (a + b) != 0) continue;
        //[0;a-1] - suf, [n-b-1; n - 1] - pref
        ll A,B;
        bool ok = 1;
        if (sh){
            cout<<"a b = "<<a<<' '<<b<<"\n";
        }
        int id;
        for (int i = a; i + (a + b)  - 1 < n - b; i += a + b){//+-1 после i + (a + b)  ТАК СИЛЬНО ВСЕ МЕНЯЕТ -- ПОЧЕМУ???
            id = i;
            if (sh){
                cout<<"l r = "<<i<<' '<<i + a + b - 1<<"\n";
            }
            A = pf[a - 1] * powp[i] % mod;
            B = (pf[i + a - 1] - pf[i - 1] + mod) % mod;
            if (A != B){
                ok=0;
                break;
            }
        }
        B = (pf[n - 1] - pf[id - 1] + mod) % mod;
        A = pf[n - id - 1] * powp[id] % mod;
        if (A != B){
            ok = 0;
        }
        if (ok){
            //cout<<"OK\n";
            //cout<<"a b = "<<a<<' '<<b<<"\n";
            ans.push_back(a+b);
        }


    }


    for (int a = 1; a <= n; ++a){
        for (int b = 1; b <= n - a; ++b){
            //if ((n - a - b) % (a + b) != 0) continue;
            //[0;a-1] - suf, [n-b-1; n - 1] - pref
            bool ok = 1;
            if (sh){
                cout<<"a b = "<<a<<' '<<b<<"\n";
            }
            for (int i = a; i + (a + b)  - 1 < n - b; i += a + b){//+-1 после i + (a + b)  ТАК СИЛЬНО ВСЕ МЕНЯЕТ -- ПОЧЕМУ???
                if (sh){
                    cout<<"l r = "<<i<<' '<<i + a + b - 1<<"\n";
                }
                ll A = (pf[a - 1] * powp[n - b] % mod + (pf[n - 1] - pf[n - b - 1] + mod) % mod) % mod;
                ll B = (pf[i + a + b - 1] - pf[i - 1] + mod) * powp[n - (i + a + b - 1)] % mod;
                if (A != B){
                    ok=0;
                    break;
                }
            }
            if (ok){
                //cout<<"OK\n";
                //cout<<"a b = "<<a<<' '<<b<<"\n";
                ans.push_back(a+b);
            }
        }
    }
    sort(ans.begin(), ans.end());
    if (sh){
        cout<<"ans\n";
        cv(ans);
    }
    cout<<ans[0];
}
/*
abaabaabaa
*/