#include <bits/stdc++.h>   using namespace std;   const string T =  abacaba ;   bool check(string s) {     int cnt = 0;     for (int i = 0; i < s.length() - 6; i++)       if (s.substr(i, 7) == T) cnt++;     return (cnt == 1);   }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) {       int n, f = 0, q = 0, qq = 0, p = 0;       cin >> n;       string s;       cin >> s;       bool flag = true;       for (int i = 0; i < n - 6; i++) {         string ss = s;         bool f = true;         for (int j = 0; j < 7; j++) {           if (s[i + j] != T[j] && s[i + j] !=  ? ) {             f = false;             break;           }           ss[i + j] = T[j];         }         if (f && check(ss)) {           flag = false;           cout <<  Yes  << endl;           for (int i = 0; i < n; i++) cout << ((ss[i] ==  ? ) ?  z  : ss[i]);           cout << endl;           break;         }       }       if (flag) cout <<  No n ;     }     return 0;   }   