#include <iostream>                                                               
#include <string>                                                                 
#include <cassert>                                                               
 
using namespace std;                                                              
 
int main() {                                                                      
    string construct;                                                             
    while(true) {                                                                 
        string current;                                                           
        getline(cin, current);                                                    
        assert(!cin.eof());                                                       
        if (current.find("end") == 0) { break; }                              
        cout << current << endl;                                        
        construct.append(current);                                          
    }                                                                             
    cout << construct << endl;                                          
    return 0;                                                                     
}   

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Rmlyc3QgbGluZS4KU2Vjb25kIGxpbmUuClRoaXJkIGxpbmUuCmVuZAo=

First line.
Second line.
Third line.
end