#pragma GCC optimize("Ofast") #include using namespace std; typedef long long int ll; typedef unsigned long long ull; mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); ll myRand(ll B) { return (ull)rng() % B; } int main(){ cin.tie(nullptr); ios::sync_with_stdio(false); string s; cin >> s; for(int i=0;i0 and s[i-1]==s[i])continue; cout << s[i]; } cout << endl; }