// https://yukicoder.me/submissions/692208
// 上をベースに書き換え

#include <atcoder/string>
#include <iostream>
#include <numeric>
#include <set>
#include <string>
#include <vector>

using namespace atcoder;
using namespace std;

int main(void) {
    string s;
    cin >> s;
    const int n = s.size();
    const vector<int> z = z_algorithm(s);
    vector<int> ord;
    set<int> st;
    for (int i = 1; i < n; ++i) {
        if (z[i] >= 1) {
            ord.push_back(i);
            st.emplace(i);
        }
    }
    st.emplace(n);
    sort(ord.begin(), ord.end(), [&](int a, int b) { return z[a] < z[b]; });
    vector<int> dp(n + 1, 0);
    for (int i = 1, x = 0; i < n; ++i) {
        int d = dp[i];
        dp[i + 1] = max(dp[i + 1], d);
        d -= 1;
        int pos = *st.lower_bound(i);
        while (pos < n) {
            d += i - 1;
            dp[pos + i] = max(dp[pos + i], d);
            pos = *st.lower_bound(pos + i);
        }
        for (; x < (int)ord.size() && z[ord[x]] == i; ++x) {
            st.erase(ord[x]);
        }
    }
    int ans = n - dp[n];
    cout << ans << endl;
}