#include <bits/stdc++.h>
using namespace std;
long long get_hash(string s, long long a, long long b) {
    long long hash = 0LL;
    for( int i = 0; i < s.length(); i++ ) {
        hash = (hash*a+s[i])%b;
    }
    return hash;
}
int main() {
    int N = 4;
    long long a, b;
    cin >> a >> b;
    unordered_map<long long, string> mp;
    deque<string> que;
    que.emplace_back("");
    while( !que.empty() ) {
        string crr = que.front();
        que.pop_front();
        if( crr.length() == N ) {
            long long hash = get_hash(crr, a, b);
            if( mp.count(hash) ) {
                cout << crr << endl;
                cout << mp[hash] << endl;
                break;
            }else {
                mp[hash] = crr;
            }
        }else {
            for( char c = 'a'; c <= 'z'; c++ ) {
                que.emplace_back(crr+c);
            }
        }
    }
}