#include <iostream>
#include <vector>

#include <atcoder/string>
#include <atcoder/segtree>

int op(int x, int y) {
    return std::max(x, y);
}
int e() {
    return 0;
}

int main() {
    std::string s;
    std::cin >> s;
    const int n = s.size();

    std::vector<int> z = atcoder::z_algorithm(s);

    atcoder::segtree<int, op, e> seg(z);

    std::vector<int> dp(n + 1, n);
    dp[1] = 1;

    for (int i = 1; i < n; ++i) {
        dp[i + 1] = std::min(dp[i + 1], dp[i] + 1);

        int c = dp[i] + 1;
        for (int j = i; j < n;) {
            int nj = seg.max_right(j, [&](int v) { return v < i; });
            if (nj == n) break;
            c += (nj - j) + 1;
            dp[nj + i] = std::min(dp[nj + i], c);
            j = nj + i;
        }
    }

    std::cout << dp[n] << std::endl;
}