#include<bits/stdc++.h>
#define D(x) cout<<"D:"<<#x<<'='<<x<<endl;
#define pb push_back
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
template<typename tn> inline tn next(void)
{
	tn k;
	cin>>k;
	return k;
}
template<typename tn> inline ostream& operator << (ostream& os, const vector<tn>& v)
{
	for(int i = 0; (unsigned)i < v.size(); i++) os<<v[i]<<' ';
	return os;
}
vector<string> ans[11] = {{"a"}, {"aa", "ab"}, {"aaa","aab","aba","abb","abc",}, {"aaaa","aaab","aaba","aabb","aabc","abaa","abab","abba","abbb","abbc","abca","abcb","abcc","abcd",}, {"aaaaa","aaaab","aaaba","aaabb","aaabc","aabaa","aabab","aabba","aabbb","aabbc","aabca","aabcb","aabcc","aabcd","abaaa","abaab","ababa","ababb","ababc","abbaa","abbab","abbba","abbbb","abbbc","abbca","abbcb","abbcc","abbcd","abcaa","abcab","abcba","abcbb","abcbc","abcca","abccb","abccc","abccd","abcda","abcdb","abcdc","abcdd","abcde",}, {"aaaaaa","aaaaab","aaaaba","aaaabb","aaaabc","aaabaa","aaabab","aaabba","aaabbb","aaabbc","aaabca","aaabcb","aaabcc","aaabcd","aabaaa","aabaab","aababa","aababb","aababc","aabbaa","aabbab","aabbba","aabbbb","aabbbc","aabbca","aabbcb","aabbcc","aabbcd","aabcaa","aabcab","aabcba","aabcbb","aabcbc","aabcca","aabccb","aabccc","aabccd","aabcda","aabcdb","aabcdc","aabcdd","aabcde","abaaaa","abaaab","abaaba","abaabb","abaabc","ababaa","ababab","ababba","ababbb","ababbc","ababca","ababcb","ababcc","ababcd","abbaaa","abbaab","abbaba","abbabb","abbabc","abbbaa","abbbab","abbbba","abbbbb","abbbbc","abbbca","abbbcb","abbbcc","abbbcd","abbcaa","abbcab","abbcba","abbcbb","abbcbc","abbcca","abbccb","abbccc","abbccd","abbcda","abbcdb","abbcdc","abbcdd","abbcde","abcaaa","abcaab","abcaba","abcabb","abcabc","abcbaa","abcbab","abcbba","abcbbb","abcbbc","abcbca","abcbcb","abcbcc","abcbcd","abccaa","abccab","abccba","abccbb","abccbc","abccca","abcccb","abcccc","abcccd","abccda","abccdb","abccdc","abccdd","abccde","abcdaa","abcdab","abcdba","abcdbb","abcdbc","abcdca","abcdcb","abcdcc","abcdcd","abcdda","abcddb","abcddc","abcddd","abcdde","abcdea","abcdeb","abcdec","abcded","abcdee","abcdef",}, 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int main(void)
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n = next<int>();
	for(int i = 0; i < ans[i].size(); i++) cout<<ans[i]<<endl;
	return ~~(0-0);
}

