Submission #1689833

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Source Code Expand

#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(n);i++)
#define loop(i,x,n) for(int i=(x);i<(n);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define mp make_pair
#define fir first
#define sec second
#define ub upper_bound
#define lb lower_bound
#define int long long
using namespace std;
const int MOD=1000000007;
const int INF=1000000009;

signed main(){
  vector<int> b(26,INF);
  int n;
  cin>>n;
  rep(i,n){
    vector<int> a(26);
    string s;cin>>s;
    rep(i,s.size())a[s[i]-97]++;
    rep(i,26)if(a[i]<b[i])b[i]=a[i];
  }
  rep(i,26)if(b[i]==INF)b[i]=0;
  rep(i,26)if(b[i]>0)rep(j,b[i])cout<<(char)(i+'a');
  cout<<endl;
  return 0;
}

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