import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        long n=scan.nextLong();
        char c='a';
        StringBuilder sb=new StringBuilder();
        int h=-1;
        for(int i=30;i>=0;--i){
            if(1L<<i>n){continue;}
            h=i;break;
        }
        for(int i=h-1;i>=0;--i){
            //2bai
            sb.append(c);
            //+1
            if((n&1<<i)!=0){
                c=c=='a'?'b':'a';
                sb.append(c);
            }
        }
        String r=new StringBuilder(sb).reverse().toString()+sb;
        if(r.length()==0)r="s";
        System.out.println(r);
    }
}