#include<bits/stdc++.h> #define ll long long #define fi first #define se second #define pb push_back #define ii pair<ll,ll> #define iii pair<ll,ii> #define all(a) a.begin(),a.end() using namespace std; const int N=3e5+5; const int mod=1e9+7; const ll inf=1e18+8; ll n,m,k,i,j,q,t; ll tot,dk,tot1=0; ll a[N],d[N]; int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); cin>>n; d[1]=0; for(int i=2;i<=n;i++) { cin>>d[i]; d[i]+=d[i-1]; } ll mn=0,l=1,r=1,mx=0; for(int i=2;i<=n;i++) { if(mn>d[i]) { mn=d[i]; l=i; } if(mx<d[i]) { mx=d[i]; r=i; } } if(mx-mn!=n-1) return cout<<-1,0; a[1]=1-d[l]; for(int i=2;i<=n;i++) a[i]=a[1]+d[i]; for(int i=1;i<=n;i++) cout<<a[i]<<" "; return 0; } /* */