#include <iostream>
#include <string>


int main()
{
    
	std::string charSet ( "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ23456789" );
	long long int counter = 0;
	std::string generatedString ( "aaaa" );

	for ( int i = 0; i < charSet.length() ; i ++ ) {
		generatedString[0] = charSet[i];
		
		for ( int k = 0; k < charSet.length() ; k++  ) {
			generatedString[1] = charSet[k];
			
			 for ( int z  = 0; z < charSet.length(); z ++ ) {
				generatedString[2] = charSet[z];
				for ( int y = 0; y < charSet.length(); y++ ) {

				generatedString[3] = charSet[y];
				std::cout << ++counter << ". " <<  generatedString << "\n";
				}
			 }
			 
			 
		}
		
	}


	
	return 0;
}