#include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <cmath>
using namespace std;
 
int main()
{
    //To take input from file and send output to file from standard input/output use freopen()
    //freopen("A-large-practice.in","r",stdin);
    //freopen("output.txt","w",stdout);
    int n;
    cin >> n;
    for (int k = 1; k <= n; k++) {
        int credit,num,price;
        cin >> credit >> num;
 
        int p[num];
        for (int i=0; i<num; i++) {
            cin >> p[i];
        }
 
        for (int i = 0; i < num-1; i++) {
            for (int j = i+1; j < num; j++) {
                if (p[i]+p[j]==credit)
                    cout << "Case #" << k << ": " << i+1 << " " << j+1 << endl;
            }
        }
    }
}
 

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3
100
3
5 75 25
200
7
150 24 79 50 88 345 3
8
8
2 1 9 4 4 56 90 3