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 char;
    risposta: string;
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]:='0';
    for i:=1 to N do 
                    begin
                      lettere[ord(A[i])-96, ord(B[i])-96]  := SY[i];
                      if SY[i]='<' then lettere[ord(B[i])-96, ord(A[i])-96] :='>'
                                   else lettere[ord(B[i])-96, ord(A[i])-96] :='<';
                    end;
    for i:=1 to 26 do
                    begin
                        for j:=1 to 26 do
                                  write(lettere[i,j],' ');
                                  writeln;
                    end;
    end.                
 
    begin if SY[i]='<' then lettere[ord(A[i])-96]:=lettere[ord(A[i])-96]+1
                                        else lettere[ord(B[i])-96]:=lettere[ord(B[i])-96]+1; end;
    risposta:=':('; count:=0;
    for i:=1 to 26 do if lettere[i]=0 then count:=count+1;
    for i:=1 to 26 do if (lettere[i]<=2) and (26-count<=N-1) then risposta:=':)';   
    writeln(risposta);
end.

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NQphICZndDsgZgpiICZndDsgYwphICZsdDsgZApkICZsdDsgYwpmICZsdDsgYgo=

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