gen_nr_patru_cifre

#include <iostream>
using namespace std;

int main()
{
	int c1,c2;
	cin>>c1>>c2;
	for(int i=c1;i<=9;++i)
        for(int j=0;j<=8;j+=2)
            for(int k=0;k<=c2;++k)
                cout<<i<<j<<k<<j<<'\n';
	return 0;
}