# include <iostream>
# include <algorithm>
# include <cstring>
using namespace std;

int a[1005], f[1005];

struct Need
{
	int l, x;
};

Need s[1005];

bool check(int x, int y)
{
	int q = 0;
	while (y)
	{
		q = q * 10 + y % 10;
		y /= 10;
	}
	int p = 0;
	while (x)
	{
		p = p * 10 + x % 10;
		x /= 10;
		if (p == q)
			return true;
	}
	return false;
}

int main()
{
//	freopen("librarian.in", "r", stdin);
//	freopen("librarian.out", "w", stdout);
	int n, q;
	cin >> n >> q;
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	memset(f, true, sizeof(f));
	for (int i = 1; i <= q; i++)
		cin >> s[i].l >> s[i].x;
	sort(a + 1, a + n + 1);
	for (int i = 1; i <= q; i++)
	{
		bool flag = false;
		for (int j = 1; j <= n; j++)
		{
			if (check(a[j], s[i].x) && f[j])
			{
				flag = true;
				f[j] = false;
				cout << a[j] << endl;
				break;
			}
		}
		if (!flag)
			cout << -1 << endl;
	}
	return 0;
}

哪位大佬能看看，这题哪错了，本地评测错误数据是对的啊