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

}