#include<iostream>
using namespace std;
int main()
{
    int DD,MM,YYYY;
     cout<<"Enter the DAY:"<<DD<<endl;
   // cin>>DD<<endl;
    cout<<"Enter the month:"<<MM<<endl;
    //cin>>MM<<endl;
    cout<<"Enter the year:"<<YYYY<<endl;
    //cin>>YYYY<<endl;
    while(1900<=YYYY>=2100;1<=MM>=12;1,1<=DD>=31)
    {
        if(MM=2)
       {
            int DD<30<<endl;
        }
        else{
            cout<<"invalid input"<<endl;};
      }
        cout<<YYYY"-"MM"-"DD<<endl;
   };
    else{
    cout<<"invalid input"<<endl;};
    return 0;
}