#include <bits/stdc++.h>
#define ioclear std::ios::sync_with_stdio(false);std::cin.tie(nullptr);std::cout.tie(nullptr);
#define endl '\n'
#define int long long 

using namespace std;

void solve()
{
	int k;
	std::cin >> k;
	std::string s;
	std::cin >> s;
	int n, m;
	std::cin >> n >> m;
	for(int i = 1; i <= m; i++)
	{
		int u, v;
		std::cin >> u >> v;
	}
	
	char t = s[(m - n + 1 + k) % k];
	if(t == '1') std::cout << 2 << endl;
	else cout << 1 << endl;
}

signed main()
{
	#ifdef ONLINE_JUDGE
	ioclear;
	#endif
	int t;
	std::cin >> t;
	while(t--)
		solve();
}