#include<bits/stdc++.h> using namespace std; struct aa{ int id,sum; bool operator <(const aa &o)const{ if(sum!=o.sum)return sum>o.sum; else return id<o.id; } }; aa jiu[1005]; int main(){ int n,t; cin>>n; for(int i=1;i<=n;i++){ cin>>t; jiu[t].id=t; jiu[t].sum++; } sort(jiu+1,jiu+n+1); for(int i=1;;i++){ if(jiu[i].sum!=0) cout<<jiu[i].id; else break; if(jiu[i+1].sum==0) ; else cout<<"->"; } return 0; }