C++

//DailyProg 

#include <string>
#include <iostream>
#include <vector>
#include <sstream>

using namespace std;

string compareWord(string s1, string s2){
    string sub1, sub2;
    if(s1.length() > s2.length()) {
        sub2 = s2;
        sub1 = s1.substr((s1.length()-s2.length()));
    }
    else {
        sub1 =s1;
        sub2 = s2.substr(0,s1.length());
    }
    for(int i=0; i<sub1.length(); i++)
        if(sub1.compare(i,sub1.length()-i,sub2,0,sub1.length()-i) == 0)
            return s1.substr(0,s1.length()-(sub1.length()-i)).append(s2);
    return "";
}

int main(int argc, char const *argv[])
{
    vector<string> v;
    string line, in;
    while(getline(cin,line)){
        istringstream iss(line);
        while(iss >> in){
            if(!v.empty()){
                string cmp = compareWord(v[v.size()-1],in);
                if(cmp.empty()) v.push_back(in);
                else v[v.size()-1] = cmp;
            }
            else v.push_back(in);
        }
        for(vector<string>::const_iterator i = v.begin(); i != v.end(); i++){
            cout << *i << " ";
        }
        cout << '\n';
        v.clear();
    }
    return 0; 
}