#include<bits/stdc++.h>
using namespace std;
const int N = 1000+10;
int f[N];
int n;
int maxi = 0;
int main(){
    cin>>n;
    for(int i = 1;i<=n;i++){
        cin>>f[i];
        maxi = max(maxi,f[i]);
    }
    cout<<maxi<<"\n";
    if(n==1){
        cout<<-1;
        return 0;
    }
    sort(f+1,f+1+n);
    for(int i = 1;i<=n-1;i++){
        cout<<f[i]<<" ";
    } 
    return 0;
}