{$APPTYPE CONSOLE}

uses
  SysUtils;

const
    N = 255;
    test = ['A'..'Z','a'..'z',' '];
var S:String[N];
    i,k,j:integer;
    F:boolean;
function check(s:string):Boolean;
 var i,j:integer;
  f:boolean;
begin
 i:=1;f:=false;
  while (i<=Length(s)) and (not(f)) do
   begin
    j:=i+1;
     while (j<=Length(s)) and (not(f)) do
      begin
        if s[i]=s[j] then f:=true;
        inc(j);
      end;
     Inc(i);
   end;
end;
begin
 readln(s);
 s:=Trim(s);
 f:=true;
 while pos('  ',s)>0 do
  delete(s,pos('  ',s),1);
 for i:=1 to length(s) do
  begin
    if not (s[i] in test) then
    F:=false;
  end;
  if f=true then
  begin
    for i:=Length(s) downto 1 do
    begin
      if s[i]=' ' then
        begin
         k:=i;
         delete(s,k,n);
         Break;
        end;
    end;
//..


..//
end
  else
   writeln('Error symbols');

    Readln;
    Readln;
end.