#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define FOR(i, k, n) for (int i = (k), _n = (n); i <= _n; i++)
#define FOV(i, k, n) for (int i = (n), _n = (k); i >= _n; i--)
#define REP(i, n) FOR(i, 1, n)
#define REV(i, n) FOV(i, 1, n)

string s, ans;
char tmp;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    if (fopen("input.txt", "r")) {
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    }

    cin >> s;
    int n = s.size();
    ans += s[0];
    tmp = s[0];

    REP(i, n - 1) {
        if (s[i] != s[i - 1]) {
            ans += s[i];
        }
    }

    cout << ans;

    return 0;
}