import static java.util.Arrays.deepToString;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Arrays;

import java.util.StringTokenizer;

public class Solution {

private static void debug(final Object...objs) {

System.out.println(deepToString(objs));

}

private String solveCase() throws IOException {

final int N = nextInt();

final int[] C = new int[N];

int sum = 0;

for (int i = 0; i < N; i++) {

final int c = nextInt();

sum ^= c;

C[i] = c;

}

if (sum != 0) return "NO";

long res = 0;

Arrays.sort(C);

for (int i = 1; i < N; i++)

res += C[i];

return String.valueOf(res);

}

private void solve() throws IOException {

final int testNumber = nextInt();

for (int test = 0; test < testNumber; test++) {

final String result = "Case #" + (test + 1) + ": " + solveCase();

pw.println(result);

System.out.println(result);

}

}

private BufferedReader br;

private PrintWriter pw;

private StringTokenizer st;

int nextInt() throws IOException {

return Integer.parseInt(next());

}

String next() throws IOException {

while (st == null || !st.hasMoreTokens()) {

st = new StringTokenizer(br.readLine());

}

return st.nextToken();

}

public static void main(final String[] args) throws IOException {

new Solution().run();

}

private void run() throws IOException {

br = new BufferedReader(new FileReader("input.txt"));

pw = new PrintWriter("output.txt");

solve();

br.close();

pw.flush();

pw.close();

}

}