include

include

include

using namespace std;
int main()
{
string s;

map<char,int> m;
while(cin>>s)
{
    m.clear();
    for(int i=0;i<s.size();i++)
    {
           if(m.find(s[i])!=m.end())
           {
                m[s[i]]++;
           }
        else 
            m[s[i]]=1;


    }
    int min=m.begin()->second;
    for(auto it=m.begin();it!=m.end();it++)
    {
        if(it->second<=min)
            min=it->second;
    }
    for(int i=0;i<s.size();i++)
    {
        if(m[s[i]]!=min)
            cout<<s[i];

    }
    cout<<endl;

}
return 0;

}