import java.util.Scanner;

public class Solution {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int T = sc.nextInt();
		for(int tc=1; tc<=T; tc++) {
			int N = sc.nextInt();	//종목개수
			int M = sc.nextInt();	//위원수
			int[] A = new int[N+1];
			int[] B = new int[M+1];
			int[] vote = new int[N+1];
			
			for(int i=1; i<=N; i++)
				A[i] = sc.nextInt();
			
			for(int i=1; i<=M; i++)
				B[i] = sc.nextInt();
			
			for(int i=1; i<=M; i++) {
				int cost = B[i];
				for(int j=1; j<=N; j++) {
					int fun = A[j];//개최비용
					if(cost>=fun) {	//개최비용이 넘지 않는다면 투표
						vote[j] += 1;
						break;
					}
				}
			}
			
			int max = 0;
			int ans = 0;
			for(int i=0; i<N; i++) {
				if(vote[i]>max) {
					max = vote[i];
					ans = i;
				}
			}
			System.out.println("#"+tc+" "+ans);
		}
	}
}