#include <iostream>
#include <vector>
#include <iterator>

using namespace std;

vector<int> data;

int main() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        int x, y;
        cin >> x;
        if (x == 1) {
            vector<int>::iterator it = data.begin();
            *it++;
            int ans = *it;
            for (it = data.begin() + 1; it <= data.end(); ++it) {
                *it++;
                ans = ans xor *it;
            }
            cout << ans;
        } else if (x == 2) {
            cin >> y;
            data.push_back(y);
            vector<int>::iterator it = data.begin();
            int ans = *it;
            for (it = data.begin() + 1; it <= data.end(); ++it) ans = ans xor *it;
            cout << ans;
        }
    }
    return 0;
}