#include <fstream>
#include <string>
#include <algorithm>
using namespace std;
bool within_limits(char c)
{
	if(c >= '1' && c <= '4')
		return true;
	return false;
}
int main()
{
	string s;
	ofstream outfile;
	outfile.open("generate.txt");

	for(unsigned long long int i = 11111111; i <= 44444444; ++i)
	{
		s = to_string(i);
		if(!any_of(s.begin(), s.end(), [](char q){return !within_limits(q);
		}))
		{
			outfile << "a ";
			for(unsigned short int j = 0; j < 4; ++j)
			{
				outfile << s[j] << ' ';
			}
			outfile << "b ";
			for(unsigned short int j = 4; j < 8; ++j)
			{
				outfile << s[j] << ' ';
			}
			outfile << '\n';
		}
	}

	outfile.close();
	return 0;
}