#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define R cin>>
#define ln cout<<'\n'
#define ll long long
#define in(a) insert(a)
#define pb(a) push_back(a)
#define pd(a) printf("%.12f\n",a)
#define mem(a) memset(a,0,sizeof(a))
#define all(c) (c).begin(),(c).end()
#define iter(c) __typeof((c).begin())
#define rrep(i,n) for(ll i=(ll)(n)-1;i>=0;i--)
#define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++)
#define rep(i,n) REP(i,0,n)
#define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++)
ll check(ll n,ll m,ll x,ll y){return x>=0&&x<n&&y>=0&&y<m;}void pr(){ln;}
template<class A,class...B>void pr(const A &a,const B&...b){cout<<a<<(sizeof...(b)?" ":"");pr(b...);}
template<class A>void PR(A a,ll n){rep(i,n)cout<<(i?" ":"")<<a[i];ln;}
const ll MAX=1e9+7,MAXL=1LL<<61,dx[8]={-1,0,1,0,-1,-1,1,1},dy[8]={0,1,0,-1,-1,1,1,-1};
typedef pair<ll,ll> P;

void Main() {
  ll n;
  cin >> n;
  vector<ll> c[n];
  rep(i,n) {
    string s;
    cin >> s;
    vector<ll> d(26,0);
    rep(j,s.size()) d[s[j]-'a']++;
    c[i]=d;
  }
  rep(i,n) {
    rep(j,26) {
      vector<ll> a=c[i];
      a[j]++;
      ll cnt=0;
      rep(k,n) {
        ll s=0;
        rep(l,26) {
          if(a[l]<c[k][l]) s=MAX;
          else s+=a[l]-c[k][l];
        }
        if(s==1) cnt++;
      }
      if(cnt==1) {
        string s="";
        rep(j,26)rep(k,a[j]) s+=(char)(j+'a');
        pr(s);
        return;
      }
    }
  }
  pr(-1);
}

int main(){ios::sync_with_stdio(0);cin.tie(0);Main();return 0;}