// editor2
#include<iostream>
using namespace std;
int main()
{
    int y,m,d;
    {
        cin>>y>>m>>d;
        cout<<y<<"-"<<m<<"-"<<d;
    }
};
    
    if(1900<=y<=2100,1<=m<=12,1<=d<=31)
    {
        cout<<m;
    }
    else
    {
        cout<<"Invalid input";
    }