#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

int N;

string dfs(int N) {
	if(N==1) return "a";
	string S;
	if(N%2==0) {
		S=dfs(N/2);
		S=S[0]+S+S[0];
	}
	else {
		S=dfs(N-1);
		char c=S[0]+1;
		if(S[0]=='z') c='a';
		S=c+S+c;
	}
	return S;
}

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	string S="a";
	cout<<dfs(N)<<endl;
	
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}