#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld long double
#define N (1<<17)
#define M 1000000007
#define P complex<long long>
#define X real()
#define Y imag()

using namespace std;

map<string, int> mp;
vector<pair<int,string>> v;
string s;

int main() {
	cin.tie(0);
	cout.tie(0);
	ios_base::sync_with_stdio(0);
	while(cin >> s) {
		string st = "";
		for(int i=0; i<3; i++) {
			st.push_back(s[i]);
		}
		mp[st]++;
	}
	for(auto u:mp)
		v.push_back(make_pair(u.second, u.first));
	sort(v.rbegin(), v.rend());
	string ans = "";
	int lk = 0;
	while(ans.size()<490) {
		ans = ans + v[lk].second + "|";
		lk++;
	}
	for(int i=0; i<150; i++) {
		//cout << v[i].first << ", " << v[i].second << "\n";
	}
	cout<<ans;
	
}