uses crt;
const ENTER=#13;
var c:char;
begin
writeln('Вводите буквы и цифры');
c:=readkey;
while (c<>ENTER) do begin
if c in ['0'..'9'] then write(c);
c:=readkey;
end;
writeln;
end.
uses crt;
const ENTER=#13;
var c:char;
begin
writeln('Вводите буквы и цифры');
c:=readkey;
while (c<>ENTER) do begin
if c in ['0'..'9'] then write(c);
c:=readkey;
end;
writeln;
end.