//g++ 4.cpp -std=c++14 -O2 -I .
#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>
using namespace atcoder;

using ll = long long;
using ld = long double;

using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vld = vector<ld>;
using vvld = vector<vld>;

#define fi first
#define se second
#define pb push_back
#define all(a) a.begin(),a.end()
#define rep(i,start,end) for(ll i=start;i<(ll)(end);i++)
#define per(i,start,end) for(ll i=start;i>=(ll)(end);i--)

ll ans=0;
int h,w,a,b;

void dfs(int x,int y,int a,int b,vvi &grid){
  if(a==0&&b==0){
    ans++;
    return;
  }
  if(x>=h||y>=w){
    return;
  }
  if(grid[x][y]!=0){
    y++;
    if(y==w){
      x++;
      y=0;
    }
    dfs(x,y,a,b,grid);
    return;
  }
  if(b>0){
    grid[x][y]=1;
    dfs(x,y,a,b-1,grid);
    grid[x][y]=0;
  }
  if(a>0){
    if(y<w-1&&grid[x][y+1]==0){
      grid[x][y]=2;
      grid[x][y+1]=2;
      dfs(x,y,a-1,b,grid);
      grid[x][y]=0;
      grid[x][y+1]=0;
    }
    if(x<h-1&&grid[x+1][y]==0){
      grid[x][y]=3;
      grid[x+1][y]=3;
      dfs(x,y,a-1,b,grid);
      grid[x][y]=0;
      grid[x+1][y]=0;      
    }
  }
}

int main(){
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  string s;
  cin>>s;

  rep(i,0,s.size()){
    if(i>0&&s[i-1]==s[i]){
      continue;
    }
    cout<<s[i];
  }
}