#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <atcoder/modint>
#include <atcoder/string>
#include <atcoder/segtree>

using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;


namespace RMQ{
    using S = int;
    S op(S l, S r){ return max(l, r); }
    S e(){ return -1; }
    using Segtree = atcoder::segtree<S, op, e>;
}


int main(){
    string S; cin >> S;
    auto Z = atcoder::z_algorithm(S);
    int n = S.size();

    RMQ::Segtree segtree(atcoder::z_algorithm(S));
    
    vector<int> dp(n+1);
    rep(i,n+1) dp[i] = i;

    for(int x=1; x<=n; x++){
        dp[x] = min(dp[x], dp[x-1] + 1);
        int p = x, t = dp[x] + 1;
        while(p < n){
            int nx = segtree.max_right(p, [x](int v){ return v<x; });
            if(nx >= n) break;
            t += nx - p + 1;
            p = nx + x;
            dp[p] = min(dp[p], t);
        }
    }

    cout << dp[n] << '\n';
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;