#include <bits/stdc++.h>
#define NIL (-1)
#define ll long long
using namespace std;
const int64_t MOD = 1e9 + 7;
const int INF = INT_MAX;
const double PI = acos(-1.0);

int main() {
	string S;
	cin >> S;
	S.erase(unique(S.begin(), S.end()), S.end());
	cout << S << endl;
}