public static void num(String str) {
BigInteger a = new BigInteger(str);
StringBuffer sb = new StringBuffer("");
StringBuffer n = new StringBuffer("");
while (!(a.divide(div).equals(zero))) {
sb.insert(0, (char) (a.mod(div).intValue() + 96));
a = a.divide(div);
}
sb.insert(0, (char) (a.intValue() + 96));
for (int i = 0; i < str.length(); i++) {
if (i % 3 == 0 && i != 0) n.insert(0, ",");
n.insert(0, str.charAt(str.length() - i - 1));
}
while (sb.length() < 22) sb.append(" ");
System.out.println(sb + "" + n);
}
