jeeee
12345678 < 1000 NE!
12345678/1000=12345
12345 < 1000 NE!
12345/1000=12
12 < 1000 ANO!

OUTPUT: 12,

12345678-(12x1000x1000)=345678

345678/1000=345
3 45 < 1000 ANO!

OUTPUT: 12,345,

345678-(345x1000)=678

678 < 1000 ANO!

OUTPUT: 12,345,678

Co je na tom nepochopitelne? Urcite bude existovat jednodussi zpusob, tohle je prvni co me napadlo.