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

#define For(V, A, B) for(int V = (A); V <= (B); V++)
#define Back(V, A, B) for(int V = (A); V >= (B); V--)

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

void row(int a, int b, int i)
{
	For (j, 1, b - i)
		putchar(' ');
	For (j, a, i)
		put(j);
	Back (j, i - 1, a)
		put(j);
	putchar('\n');
}

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