[[MM]RoXoR[FS]]

pawn Code:

public OnPlayerConnect(playerid)
{
 new name[MAX_PLAYER_NAME];
 GetPlayerName(playerid,name,20);
 for(new i=0;name[i]!-'\0';++i) if(name[i] >= '0' && name[i] <='9') {SendClientMessage(playerid,-1,"Number's not allowed");
  Kick(playerid);
 }
}