#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define int ll

constexpr int N = 10'000;
string distinct_names[N+1];

signed main() {
	distinct_names[0] = "a";
	for(int i=1;i<=N;i++) {
		int num = i;
		while(num > 0) {
			distinct_names[i].push_back('a' + num % 26);
			num /= 26;
		}
	}
	ll n; cin >> n; 
	string s;
	vector <pair<ll,ll>> v(n);
	for(int i = 0; i < n; i++){
	    cin >> s;
	    v[i].second = i;
	    v[i].first = round(stold(s) * 1e10);
	}
	
	map<ll, vector<ll>> mp;
	
	for(auto [valor, id]: v) {
	    mp[valor].push_back(id);
	}
	
	vector<string> ans(n);
	int cnt = 0;
	for(auto &[valor, conj]: mp) {
	    vector<int> foo = conj;
	    for(auto id: conj) {
	        ans[id] = distinct_names[cnt];
	    }
	    cnt++;
	}
	
	for(auto s: ans) cout << s << '\n';
}