var
a, b, c, d, e, f: set of char;
ch: char;
begin
a := ['у', 'е', 'ы', 'а', 'о', 'э', 'я', 'и', 'ё', 'ю'];
b := ['а', 'о', '!', '?'];
write('a=');
for ch := #0 to #255 do
if ch in a then
write(ch);
writeln;
write('b=');
for ch := #0 to #255 do
if ch in b then
write(ch);
writeln;
c := a + b;
write('a=b ');
writeln(a = b);
write('a in b ');
writeln(a <= b);
write('a<>b ');
writeln(a <> b);
d := a * b;
e := a - b;
f := b - a;
write('c=');
for ch := #0 to #255 do
if ch in c then
write(ch);
writeln;
write('d=');
for ch := #0 to #255 do
if ch in d then
write(ch);
writeln;
write('e=');
for ch := #0 to #255 do
if ch in e then
write(ch);
writeln;
write('f=');
for ch := #0 to #255 do
if ch in f then
write(ch);
writeln;
b := b + ['&', '#'];
a := a * b;
write('a=');
for ch := #0 to #255 do
if ch in a then
write(ch);
writeln;
write('b=');
for ch := #0 to #255 do
if ch in b then
write(ch);
writeln;
end.