#include <bits/stdc++.h>
using namespace std;
void solve()
{
int n;
string s;
cin >> n >> s;
cout << s[s.length() - 1] << '\n';
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
int t;
cin >> t;
while (t--)
solve();
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