#include<iostream>
using namespace std;
class Date
{
    public:
    void update(string d,string m,string y,string s, int n)
    {
       int k = stoi(d);
       if(s=="add")
       {
           cout<<k+n<<"/"<<m<<"/"<<y<<endl;
       }
       else if(s=="subtract")
       {
           cout<<k-n<<"/"<<m<<"/"<<y<<endl;
       }
       else{
           cout<<"Invalid input";
       }
       return 0;
    }
}