var st, kq: string;
    vt, dai, max, d, i,j: integer;
    a:array[1..100] of string;
begin
    write('Nhap St:');
    readln(st);
    max := 0;
    st := st + ' ';
    d:=0;
    while length(st) <> 0 do 
    begin
        vt := pos(' ', st);
        dai := vt - 1;
        kq := copy(st, 1, dai);
        inc(d);
        a[d]:=kq;
        delete(st, 1, vt);
    end; 
    for i:=1 to d do
        if length(a[i])>max then 
    begin
        max:=length(a[i]);
        j:=1;
    end
    else if length(a[i])=max then inc(j);
        writeln('Co ',j,' tu dai nhat, co chieu dai la: ',max);
    writeln('cac tu do la:');
        for i:=1 to d do
        if length(a[i])=max then writeln(a[i]);   
        readln; 
end.