#include?
#define?TK_NUM?500
#define?TK_ID?600
using?namespace?std;

class?Parser{
public:
????Parser（）{
????????cin>>s;
????????lookahead=getToken（）;
????????expr（）;
????}

????int?tokenval=0;
????string?id_buffer=““;

????int?lookahead=0;
????int?current=0;
????string?s;

????void?match（int?t）{
????????if（t==lookahead）lookahead=getToken（）;
????????else?cout<<“error“;
????}
????void?expr（）{
????????factor（）;rest（）;
????}

????void?rest（）{
????????if（lookahead==‘+‘）{
????????????match（‘+‘）;term（）;cout<<‘+‘;rest（）;
????????}else?if（lookahead==‘-‘）{
????????????match（‘-‘）;term（）;cout<<‘-‘;rest（）;
????????}else?if（lookahead==‘*‘||lookahead==‘/‘）{
????????????last（）;rest（）;
????????}else?if（lookahead==‘?‘）cout<<‘\n‘;
????}
????void?term（）{
????????factor（）;last（）;
????}
????void?last（）{
????????if（lookahead==‘*‘）{
????????????match（‘*‘）;factor（）;cout<<‘*‘;last（）;
????????}else?if（lookahead==‘/‘）{
????????????match（‘/‘）;factor（）;cout<<‘/‘;last（）;
????????}else?if（lookahead==‘?‘）cout<<‘\n‘;
????}
????void?factor（）{
????????if（lookahead==TK_ID）{
????????????cout<<‘?‘<????????????match（lookahead）;
????????}else?if（lookahead==TK_NUM）{
????????????cout<<‘?‘<