#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <dirent.h>
#include <string>
#include <fstream>
using namespace std;

int main(void){
    DIR *dir;
    struct dirent *ent;
    if ((dir = opendir (".")) != NULL) {
      /* print all the files and directories within directory */
      while ((ent = readdir (dir)) != NULL) {
        //printf ("%s\n", ent->d_name);
        string katalooginimi=ent->d_name;
        string lopp=".txt";
        //cout << katalooginimi << endl;
        if(katalooginimi.length()>4){
            if(katalooginimi.compare(katalooginimi.length()-4, 4, lopp)==0){
                //cout << " lopp " << katalooginimi << endl;
                std::ifstream ifs(katalooginimi.c_str());
  std::string content( (std::istreambuf_iterator<char>(ifs) ),
                       (std::istreambuf_iterator<char>()    ) );
  std::cout << content << endl;
            }
        }
      }
      closedir (dir);
    } else {
      /* could not open directory */
      perror ("");
      return EXIT_FAILURE;
    }
}