#include<iostream>
using namespace std;
int main()
{
    int day,month,year,upd_val,new_day;
    string op;
    cin>>day>>month>>year;
    cin>>op>>new_day;
    upd_val = day-new_day;
    if(op == "add")
    {
        upd_val = day+new_day;
    }
    else(op == "subtract")
    {
        upd_val = day-new_day;
    }
    if((op != "add" && op != "subtract")||(day<0 && day>31)||(month<=0 && month>12)||(year<1)||(upd_val<0 && upd_val>31))
    {
        cout<<"Invalid input";
        return 0;
    }
    cout<<upd_val<<"/"<<month<<"/"<<year;
    return 0;
}