#include<bits/stdc++.h>
#define ll          long long
#define nl          '\n'
#define F           first
#define S           second
#define pb          push_back
#define all(a)      (a.begin()),(a.end())
#define Input       freopen("in.txt","r",stdin)
#define Output      freopen("out.txt","w",stdout)
#define PI          2*acos(0.0)
#define MOD         1000000007
using namespace std;


const int N = 2e5 + 5;

void Solve()
{
    ll k;
    cin >> k;
    ll lo = 0, hi = 1e9, mid, res = 0;
    while (lo <= hi)
    {
        mid = (lo + hi) / 2LL;
        ll tot = (mid * (mid + 1)) / 2LL;
        tot += mid;
        if (tot <= k) {
            res = tot;
            lo = mid + 1;
        }
        else
            hi = mid - 1;
    }
    if (res == k) {
        cout << 'b' << nl;
        return ;
    }
    cout << 'a' << nl;
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    int t, T = 1;
    cin >> T;
    for (t = 1; t <= T; t++)
        Solve();
    return 0;
}