#include <stdio.h>
#include <stdlib.h>
 
#define BASE 0x61
 
int main(int argc, char **argv)
{
	char name[4];
	FILE *fp;
	fp = fopen("list.txt", "w");
 
	name[0] = '\0';
	name[1] = '\0';
	name[2] = '\0';
	name[3] = '\0';
 
	int i;
	int y = 0;
	int z = 0; 
	for(i = 0; i < 26; ++i)
	{
		name[0] = BASE + i;
		fprintf(fp, "%s\n", name);
 
		if(i == 25)
		{
			name[0] = BASE;
			int x;
			for(x = 0; x < 26; ++x)
			{
				name[1] = BASE + x;
				fprintf(fp, "%s\n", name);
				if(x == 25)
				{
					if(y)	break;
					name[0] = name[0] + 1;
					x = 0;
					y = 1;
				}
			}
		}		 
	}
 
	fclose(fp);
	exit(0);
}