//Normal #define _GLIBCXX_DEBUG #define ll long long #include using namespace std; using Graph = vector>; void print(auto a){ cout << a; } void prints(auto a){ cout << a << " "; } void prints(){ cout << " "; } void printl(auto a){ cout << a << endl; } void printl(){ cout << endl; } void fix(int n){ cout << fixed << setprecision(n); } int siz(string s){ return (int)s.size(); } int main(){ string S; cin >> S; int s = (int)S.size(); string T = ""; T += S[0]; for(int i = 1; i < s; i++){ if(S[i-1] != S[i]) T += S[i]; } printl(T); return 0; }