#define PROBLEM "https://yukicoder.me/problems/no/1469"

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template<class T>
using V = std::vector<T>;
#define REP(i, n) for (ll i = (ll)0; i < (ll)(n); i++)
#define REPS(i, s, n) for (ll i = (ll)(s); i < (ll)(n); i++)
#define RREP(i, n) for (ll i = (ll)(n); i > (ll)0; i--)
#define RREPS(i, s, n) for (ll i = (ll)(n); i > (ll)(s); i--)
struct io {
    io() { cin.tie(0)->sync_with_stdio(0); }
} caller;

template<typename T = char>
struct RunLengthEncoding {
  public:
    RunLengthEncoding() = default;

    std::vector<std::pair<T, int>> encode(const std::vector<T> &v) {
        std::vector<std::pair<T, int>> ret;
        for (int i = 0; i < v.size();) {
            int j = i;
            while (j < v.size() && v[j] == v[i]) j++;
            ret.emplace_back(v[i], j - i);
            i = j;
        }

        return ret;
    }

    std::vector<std::pair<char, int>> encode(const std::string &s) {
        return encode(std::vector<char>(begin(s), end(s)));
    }

    std::vector<T> decode(const std::vector<std::pair<T, int>> &code) {
        std::vector<T> ret;
        for (const auto &[c, cnt]: code) {
            for (int i = 0; i < cnt; i++) ret.push_back(c);
        }

        return ret;
    }

    std::string decode_s(const std::vector<std::pair<char, int>> &code) {
        std::vector<char> v = decode(code);
        return std::string(begin(v), end(v));
    }
};

int main() {
    string s;
    cin >> s;

    RunLengthEncoding rle;
    auto code = rle.encode(s);

    for (const auto &[c, cnt]: code) cout << c;
    cout << endl;

    return 0;
}