program baigiai;
uses crt;
var A:array[0..1000] of integer;
n,i,j,tg,d:integer;
begin
clrscr;
write('Nhap so luong phan tu n: '); readln(n);
writeln('NHAP GIA TRI TUNG PHAN TU CUA MANG');
for i:=1 to n do
begin
write('Nhap phan tu thu ',i,': ');
readln(A[i]);
end;
for i:=1 to n-1 do
for j:=i+1 to n do
if A[i]>A[j] then
begin
tg:=A[i];
A[i]:=A[j];
A[j]:=tg;
end;
i:=1;
while i<=n do
begin
if A[i]<>A[i+1] then
begin
d:=1;
j:=i-1;
while (A[i]=A[j]) and (j>=1) do
begin
j:=j-1;
d:=d+1;
end;
if d mod 2=1 then writeln(A[i]);
end;
i:=i+1;
end;
readln
end.
