[Stinged]

Код:

new str[24], pos;
GetPlayerName(playerid, str, 24);
pos = strfind(str, "_");
if (pos != -1)
{
    new vehicleid = GetPlayerVehcileID(playerid);
    format(str, sizeof (str), "%c%c%i", str[0], str[pos+1], vehicleid);
    SetVehicleNumberPlate(vehicleid, str);
}