#include<iostream>
using namespace std;
int main()
{
    int DD,MM,YYYY
    cout<<"Enter the data: "<<endl;
    cin>>DD<<endl;
    cout<<"Enter the month: "<<endl;
    cin>>MM<<endl;
    cout<<"Enter tne year: "<<endl;
    cin>>YYYY<<endl;
    if(1900<=YY<=2100,1<=MM>=12,1,1<=DD>=13);
    {
        cout<<YYYY"-"MM"-"DD<<endl;
    };
    else{
        cout<<"invalid input"<<endl};
        return 0;
    }
}