include <bits/stdc++.h>

define pb push_back

define pf push_front

define itn int

define ll long long

define sortv sort(v.begin(), v.end())

define reversev reverse(v.begin(), v.end())

define sb substr

define is insert

define fora for (int i=0; i < n; i++) cin >> a[i];

using namespace std; int main() { string a; getline(cin, a); for (int i=0; i < a.length(); i++) { if (a[i] != ' ') cout << a[i]; else if (a[i] != a[i+1]) cout << a[i]; } }