#include <bits/stdc++.h>
#define dbg(x) cerr << #x << ':' << (x) << endl;
#define ALL(x) x.begin(),x.end()
using ll = long long;
using ld = long double;
using namespace std;

int main()
{
    int n;
    cin >> n;
    auto gen = [](int x) -> string
    {
        string ret;
        while (x > 0)
        {
            ret.push_back('a' + x % 26);
            x /= 26;
        }
        return ret;
    };
    int cnt = 1;
    map<long long, string> mp;
    for (int i = 0; i < n; ++i)
    {
        string s;
        cin >> s;
        if (s.back() == 'L') s.pop_back();
        int id = s.find('.');
        if (id == -1) id = s.size();
        long long val = 0;
        for (int j = 0; j < id; ++j)
        {
            val *= 10;
            val += s[j] - '0';
        }
        if (id < s.size())
        {
            int nok = s.size() - id - 1;
            for (int j = id + 1; j < s.size(); ++j)
            {
                val *= 10;
                val += s[j] - '0';
            }
            nok = 10 - nok;
            while (nok--) val *= 10;
        }
        else
        {
            val *= 10000000000LL;
        }
        // cout << val << endl;
        if (mp.find(val) == mp.end())
        {
            mp[val] = gen(cnt);
            ++cnt;
        }
        cout << mp[val] << endl;
    }
}