program lab10;
var
M: set of char;
c: char;
begin
writeln('Please enter symbols');
M := [];
while not eof do
begin
read(c);
if (c in ['f'..'m']) or (c in ['+','-','*','/']) then
M := M + [c];
end;
writeln('Result:');
for c := 'f' to 'm' do
if c in M then
write(c, ' ');
if '+' in M then write('+ ');
if '-' in M then write('- ');
if '*' in M then write('* ');
if '/' in M then write('/ ');
writeln;
end.
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