#include <bits/stdc++.h>
using namespace std;


void code(int n)
{


	
	
}

void debug(int n, int m)
{


}

int main()
{
	int t;
	cin>>t;
	long long int n;
	long long int quad;
	long long int check;
	long long int check2;
	for(int i=0;i<t;i++)
	{
		cin>>n;
		if(n>3)
		{
			quad = (sqrt(1+(8*(n-4))) -1)/2;
			
			check = ((quad*(quad+1))/(2))+ quad;
			check2 = (((quad+1)*(quad+2))/(2)) + quad+1;
		if(check==n||check2==n)
		{
			cout<<'b';
		}
		else
		{
			cout<<'a';
		}	
		}
		else
		{
			if(n==2)
			{
				cout<<'b';
			}
			else
			{
				cout<<'a';
			}
		}
		cout<<"\n";
	}
}