program paradox;
var n, i, j, count:integer;
    S: array[1..325] of string;
    A,B,SY: array [1..325] of char;
    lettere : array[1..26,1..26] of boolean;
    visited : array [1..26] of char;
    risposta: string;
    ciclo : boolean;
 
procedure DFS(u: Integer);
var v: Integer;
begin
  ciclo:=false;
  visited[u]:='2';  writeln ('u  ',u, ' ');
  for v:=1 to 26 do   if (lettere[u,v] = true) then begin  if visited[v]='1' then begin writeln ('v  ',v); DFS(v)end
                                                                             else begin writeln ('ciao  ',v,' ',visited[v]); if visited[v]='2' then ciclo:=true; end; end;
 
  visited[u]:='3';                                                                       
 
   writeln (visited[v]);                                                  
writeln(ciclo); 
end;
 
begin
    readln(N);
    for i:=1 to  N  do readln(S[i]);
    for i:=1 to N do begin A[i]:=S[i][1]; SY[i]:=S[i][3]; B[i]:=S[i][5];end;
    for i:=1 to 26 do 
                 for j:=1 to 26 do lettere[i, j]:=false;
    for i:=1 to 26 do visited[i]:='1';
    ciclo := false;
    for i:=1 to N do 
                    begin
                      if SY[i]='<' then lettere[ord(A[i])-96, ord(B[i])-96]  := true
                                   else if SY[i]='>' then lettere[ord(B[i])-96, ord(A[i])-96] :=true;
                    end;
    DFS(1);
    if ciclo=true then risposta:=':('
                  else risposta:=':)';
    writeln(risposta);
    end.
 

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NQphICZndDsgZgpiICZndDsgYwphICZsdDsgZApkICZsdDsgYwpmICZsdDsgYg==

5
a > f
b > c
a < d
d < c
f < b