Program BT;
Uses crt;
var a:array[1..100] of integer;
b:array[1..100] of integer;
begin
clrscr;
write('So phan tu cua day a la : ');readln(m);
for i:=1 to m do
begin
write('a[',i,']=');readln(a[i]);
end;
write('So phan tu cua day b la ');readln(n);
for i:=1 to n do
begin
write('b[',i,']=');readln(b[i]);
end;
for i:=1 to m do
for j:=1 to n do
if a[i]<>b[j] then write(a[i],b[j]);
readln
end.