#include<iostream>
using namespace std;
int main()
{
    int DD,MM,YYYY;
     cout<<"Enter the DAY:"<<DD<<endl;
   // cin>>DD<<endl;
    cout<<"Enter the month:"<<endl;
    //cin>>MM<<endl;
    cout<<"Enter the year:"<<endl;
    //cin>>YYYY<<endl;
    if(1900<=YYYY>=2100,1<=MM>=12,1,1<=DD>=31);
    {
        if(MM=2)
        {
            DD<=29<<endl;
        }
        cout<<YYYY"-"MM"-"DD<<endl;
    };
    else{
    cout<<"invalid input"<<endl;};
    return 0;
}