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#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 10;
int q[N], hh, tt;
int main() {
int n;
cin >> n;
while (n--) {
string op;
cin >> op;
if (op == "push") {
cin >> q[++tt];
if (tt == N) tt = 0; // 加冒了，就回到0
} else if (op == "empty")
hh == tt ? cout << "YES" << endl : cout << "NO" << endl;
else if (op == "query")
printf("%d\n", q[hh]);
else {
hh++;
if (hh == N) hh = 0; // 加冒了，就回到0
}
return 0;
