Problem: The length of the longest common prefix of two strings s = s_1 s_2 … s_n and t = t_1 t_2 … t_m is defined as the maximum integer k (0 ≤ k ≤ min(n,m)) such that s_1 s_2 … s_k equals t_1 t_2 … t_k.

Koa the Koala initially has n+1 strings s_1, s_2, ..., s_{n+1}.

For each i (1 ≤ i ≤ n) she calculated a_i — the length of the longest common prefix of s_i and s_{i+1}.

Several days later Koa found these numbers, but she couldn't remember the strings.

So Koa would like to find some strings s_1, s_2, ..., s_{n+1} which would have generated numbers a_1, a_2, ..., a_n. Can you help her?

If there are many answers print any. We can show that answer always exists for the given constraints. 

Input

Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 100) — the number of test cases. Description of the test cases follows.

The first line of each test case contains a single integer n (1 ≤ n ≤ 100) — the number of elements in the list a.

The second line of each test case contains n integers a_1, a_2, …, a_n (0 ≤ a_i ≤ 50) — the elements of a.

It is guaranteed that the sum of n over all test cases does not exceed 100.

Output

For each test case:

Output n+1 lines. In the i-th line print string s_i (1 ≤ |s_i| ≤ 200), consisting of lowercase Latin letters. Length of the longest common prefix of strings s_i and s_{i+1} has to be equal to a_i.

If there are many answers print any. We can show that answer always exists for the given constraints.

Example

Input


4
4
1 2 4 2
2
5 3
3
1 3 1
3
0 0 0


Output


aeren
ari
arousal
around
ari
monogon
monogamy
monthly
kevinvu
kuroni
kurioni
korone
anton
loves
adhoc
problems

Note

In the 1-st test case one of the possible answers is s = [aeren, ari, arousal, around, ari].

Lengths of longest common prefixes are:

  * Between \color{red}{a}eren and \color{red}{a}ri → 1 
  * Between \color{red}{ar}i and \color{red}{ar}ousal → 2 
  * Between \color{red}{arou}sal and \color{red}{arou}nd → 4 
  * Between \color{red}{ar}ound and \color{red}{ar}i → 2 

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.Arrays;
import java.util.StringJoiner;
import java.util.StringTokenizer;

public class MainA {

    public static void main(String[] args) {
        var sc = new FastScanner(System.in);
        var pw = new PrintWriter(System.out);
        var T = sc.nextInt();
        for (int i = 0; i < T; i++) {
            var N = sc.nextInt();
            var A = sc.nextIntArray(N);
            solve(N, A, pw);
        }
        pw.flush();
    }

    private static void solve(int N, int[] A, PrintWriter pw) {
        String[] S = new String[N+1];

        if( A[0] == 0 ) {
            S[0] = "a";
            S[1] = "b";
        } else {
            S[0] = s('a', A[0]);
            S[1] = copy(S[0]);
        }
        for (int i = 1; i < N; i++) {
            int a = A[i];
            String prev1 = S[i];
            String prev2 = S[i-1];

            if( a == 0 ) {
                if( prev1.charAt(0) == 'a' ) {
                    S[i+1] = "b";
                } else {
                    S[i+1] = "a";
                }
                continue;
            }


            if( a <= prev1.length() ) {
                String curr = prev1.substring(0, a);
                S[i+1] = curr;
            } else {
                String curr = copy(prev1);
                int len = curr.length();
                var b = new StringBuilder();
                b.append(curr);

                // prev2 != curr
                for (int j = len; j < a; j++) {
                    int c;
                    if( prev2.length() > j ) {
                        c = (prev2.charAt(j)-'a' + 1)%26;
                    } else {
                        c = 0;
                    }
                    b.append( (char)('a' + c) );
                }
                S[i] = b.toString();
                S[i+1] = b.toString();
            }
        }

        for (String s : S) {
            pw.println(s);
        }
    }

    private static String copy(String s) {
        return new String(s.toCharArray());
    }


    private static String s(char c, int n) {
        var b = new StringBuilder();
        for (int i = 0; i < n; i++) {
            b.append(c);
        }
        return b.toString();
    }

    @SuppressWarnings("unused")
    static class FastScanner {
        private final BufferedReader reader;
        private StringTokenizer tokenizer;

        FastScanner(InputStream in) {
            reader = new BufferedReader(new InputStreamReader(in));
            tokenizer = null;
        }

        String next() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        String nextLine() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    return reader.readLine();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken("\n");
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        int[] nextIntArray(int n) {
            var a = new int[n];
            for (int i = 0; i < n; i++) a[i] = nextInt();
            return a;
        }

        int[] nextIntArray(int n, int delta) {
            var a = new int[n];
            for (int i = 0; i < n; i++) a[i] = nextInt() + delta;
            return a;
        }

        long[] nextLongArray(int n) {
            var a = new long[n];
            for (int i = 0; i < n; i++) a[i] = nextLong();
            return a;
        }
    }

    static void writeLines(int[] as) {
        var pw = new PrintWriter(System.out);
        for (var a : as) pw.println(a);
        pw.flush();
    }

    static void writeLines(long[] as) {
        var pw = new PrintWriter(System.out);
        for (var a : as) pw.println(a);
        pw.flush();
    }

    static void writeSingleLine(int[] as) {
        var pw = new PrintWriter(System.out);
        for (var i = 0; i < as.length; i++) {
            if (i != 0) pw.print(" ");
            pw.print(as[i]);
        }
        pw.println();
        pw.flush();
    }

    static void debug(Object... args) {
        var j = new StringJoiner(" ");
        for (var arg : args) {
            if (arg == null) j.add("null");
            else if (arg instanceof int[]) j.add(Arrays.toString((int[]) arg));
            else if (arg instanceof long[]) j.add(Arrays.toString((long[]) arg));
            else if (arg instanceof double[]) j.add(Arrays.toString((double[]) arg));
            else if (arg instanceof Object[]) j.add(Arrays.toString((Object[]) arg));
            else j.add(arg.toString());
        }
        System.err.println(j.toString());
    }
}