#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;

void process(string s)
{
	cout<< s;
}
int main()//int argc,char* argv[]
{
	vector<string> files;
	string fileName, s;

	cout<<"Enter filenames :(Ctrl+Z to end)"<<endl;
	while (cin>>fileName)
		files.push_back(fileName);
	ifstream input;
	vector<string>::const_iterator it = files.begin();

	while (it != files.end())
	{
		input.open(it->c_str());
		if (!input)
		{
			cerr<<"error :can not open file:" <<*it <<endl;
			input.clear();
			++it;
		}
		else
		{
			while (input >> s)
				cout<<s<<endl;
			input.close();
			input.clear();
			++it;
		}
	}
	return 0;
}