#include <bits/stdc++.h>   #pragma GCC optimize( O3 )   #pragma GCC target( sse4 )   using namespace std;   template <class T>   T gcd(T a, T b) {     return ((b == 0) ? a : gcd(b, a % b));   }   void solve() {     int n, k;     long long x;     cin >> n >> k >> x;     string s;     cin >> s;     x--;     int cnt = 0;     vector<int> nm;     for (int i = n - 1; i >= 0; i--) {       if (s[i] ==  * )         cnt++;       else {         if (cnt) nm.push_back(cnt);         cnt = 0;       }     }     if (cnt) nm.push_back(cnt);     int uwu = 0;     vector<int> d;     while (x > 0) {       int cr = (nm[uwu++] * k) + 1;       d.push_back(x % cr);       x /= cr;     }     int ind = 0, lst = -1;     string ans =   ;     for (int i = n - 1; i >= 0; i--) {       if (s[i] ==  a )         ans +=  a , lst = 1;       else {         if (!lst) continue;         if (ind == (int)(d.size())) continue;         for (int j = 0; j < (int)(d[ind]); j++) ans +=  b ;         ind++;         lst = 0;       }     }     reverse(ans.begin(), ans.end());     cout << ans <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     int t;     cin >> t;     while (t--) solve();     return 0;   }   