[emokidx]

you have to add

pawn Код:

switch(listitem)

how can you use cases without knowing what you are switching them for?
you also miss one bracket

pawn Код:

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    if(dialogid == 1)
    {
        switch(listitem)
        {
            case 1:
            {
                SetPlayerFightingStyle(playerid, 4);
            }
            case 2:
            {
                SetPlayerFightingStyle(playerid, 5);
            }
            case 3:
            {
                SetPlayerFightingStyle(playerid, 6);
            }
            case 4:
            {
                SetPlayerFightingStyle(playerid, 7);
            }
            case 5:
            {
                SetPlayerFightingStyle(playerid, 15);
            }
            case 6:
            { // <-- missing bracket
                SetPlayerFightingStyle(playerid, 26);
            }
        }

    }
    return 1;
}

this should be the correct one.
also, try to indent codes better.