#include <iostream>
using namespace std;
int main()
{
int T, N, M, Mx, Pos, input;
int vote[11];
cin >> T;
while (T--)
{
for (int j = 0; j < 10; j++)
vote[j] = 0;
cin >> N >> M;
for (int i = 0; i < M; i++)
{
for (int j = 0; j < N; j++)
{
cin >> input;
vote[j]+=input;
}
}
Mx = -1;
Pos = 0;
for (int i = 0; i < N; i++)
{
if (vote[i] > Mx)
{
Mx = vote[i];
Pos = i;
}
}
cout << Pos + 1 << "\n";
}
}