#include<iostream>
#include<cstdio>
#include<cstring>
#include<vector>
using namespace std;
vector<string>s1,s2;
string form(string a){
    string b;
    for(int i=0;i<a.size();++i){
        char c=a[i];
        if(c>='A'&&c<='Z')c=c-'A'+'a';
        b.push_back(c);
    }
    return b;
}
char s[100000];
string s0;
int main(){
    cin>>s;
    int n=strlen(s),cnt=0;
    s1.push_back("");
    for(int i=0;i<n;++i){
        if(s[i]=='!'){++cnt;s1.push_back("");continue;}
        s1[cnt]+=s[i];
    }
    s0=s1.back();
    s1.pop_back();
    for(int i=0;i<s1.size();++i)s2.push_back(form(s1[i]));
    while(1){
        int pos=-1;
        for(int i=0;i+1<s1.size();++i)if(s2[i]==s2[i+1]){pos=i+1;break;}
        if(pos==-1)break;
        for(int i=pos;i+1<s1.size();++i)s1[i]=s1[i+1],s2[i]=s2[i+1];
        s1.pop_back(),s2.pop_back();
    }
    while(1){
        int pos=-1;
        for(int i=0;i+2<s1.size();++i)if(s2[i]==s2[i+2]){pos=i+1;break;}
        if(pos==-1)break;
        for(int i=pos;i+2<s1.size();++i)s1[i]=s1[i+2],s2[i]=s2[i+2];
        s1.pop_back(),s2.pop_back();
        s1.pop_back(),s2.pop_back();
    }
    for(int i=0;i<s1.size();++i)cout<<s1[i]<<"!";
    cout<<s0;
    return 0;
}