#include <stdio.h>

int main(void)
{
	int i, index, n, res, x;
	int looptimes, ri;
	int a[10];

	int search(int list[], int n, int x);

	scanf("%d", &looptimes);
	for (ri = 1; ri <= looptimes; ++ri) {
		scanf("%d", &n);
		for (i = 0; i < n; ++i) {
			scanf("%d", &a[i]);
		}
		scanf("%d", &x);
		res = search(a, n, x);
		if (res != -1) {
			printf("index = %d\n", res);
		} else {
			printf("Not found\n");
		}
	}

	return 0;
}

int search(int list[], int n, int x) {
	int i;
	for (i = 0; i < n; ++i) {
		if (list[i] == x) {
			return i;
		}
	}
	return -1;
}