#include<bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string s, tmp = "";
    vector<pair <char, int> > stak;
    vector<string > gg;
    cin >> s;
    s+="<>";
    if(s[0] != '<'){
        s[0] = '<';
        cout << s << endl;
        return 0;
    }
    else if(s[s.size() - 1] != '>'){
        s[s.size() - 1] = '>';
        cout << s << endl;
        return 0;
    }
    stak.push_back(make_pair('<', 0));
    int ind = -1;
    for(int i = 1; i < s.size(); ++i){
        if(s[i] == '<'){
            stak.push_back(make_pair('<',i));
            if(stak.size() > 1){
                ind = stak[1].second;
                break;
            }
        }
        if(s[i] == '>'){
            ind = i;
            if(s[i + 1] != '<'){
                break;
            }
            stak.pop_back();
        }
    }
    bool flag = false, wtf = false;
    for(int i = 1; i < s.size(); ++i){
        if(s[i - 1] == '<'){
            flag = true;
            if(s[i] == '/') wtf = true;
        }
        if(s[i] == '>' && i != ind){
            flag = false;
            if (!wtf){
                gg.push_back(tmp);
                tmp = "";
            }
            else{
                if(gg[gg.size() - 1] == tmp){
                    gg.pop_back();
                    tmp = "";
                }
                else {
                    gg.push_back(tmp);
                    break;
                }
            }
            tmp = "";
            wtf = false;
        }
        if((s[i] != '/' || s[i - 1] != '<') && flag){
            tmp += s[i];
        }
    }
    flag = 0;
    for(int i = 1; i < gg[gg.size() - 1].size() - 1; ++i){
        if(gg[gg.size() - 1][i] == '<' || gg[gg.size() - 1][i] == '>'){
            flag = 1;
        }
    }
    tmp = "";
    for(int i = 0; i < s.size(); ++i){
        if(s[i] == '<' || s[i] == '>' || s[i] == '/'){
            if(!flag){
                if(tmp == gg[gg.size() - 2]){
                    cout << s.substr(0, i - tmp.size()) + gg[gg.size() - 1] + s.substr(i, s.size() - 2 - i);
                    return 0;
                }
            }
            else{
                if(tmp == gg[gg.size() - 1]){
                    cout << s.substr(0, i - tmp.size()) + gg[gg.size() - 2] + s.substr(i, s.size() - 2 - i);
                    return 0;
                }
            }
            tmp = "";
        }
        else
            tmp += s[i];
    }
    return 0;
}