#!/usr/bin/tcc -run
#include <stdlib.h>
#include <stdio.h>

void put(int c)
{
	putchar(c < 10 ? '0' + c : 'a' + c - 10);
}

void row(int a, int b, int i)
{
	int j;
	for (j = 0; j < b - i; j++)
		putchar(' ');
	for (j = a; j <= i; j++)
		put(j);
	for (j = i - 1; j >= a; j--)
		put(j);
	putchar('\n');
}

int main(int argc, char *argv[])
{
	int a = 1, b = 9, i;
	if (argc > 1)
		b = atoi(argv[1]);
	if (argc > 2)
		a = b, b = atoi(argv[2]);
	for (i = a; i <= b; i++)
		row(a, b, i);
	for (i = b - 1; i >= a; i--)
		row(a, b, i);
	return 0;
}