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(rextestercom/EUBAMC2172)
program pas_znanija_34592817;
var
n, ai, i, max1, max2:integer;
begin
max1:=0;
max2:=0;
read(n);
for i:=1 to n do begin
read(ai);
if ai>=max1 then begin
max2:=max1;
max1:=ai;
end;
if (ai>max2) and (ai<max1) then max2:=ai;
end;
if n=1 then max2:=-1;
write(max2);
end.