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#include <iostream>
#include <string>
#include <queue>
using namespace std;
int main() {
cin.tie(0);
cin.sync_with_stdio(0);
int n;
cin >> n;
queue<int> q;
for (int i = 0; i < n; i++) {
string command;
cin >> command;
if (command == "push") {
int data;
cin >> data;
q.push(data);
}
else if (command == "pop") {
if (!q.empty()) {
cout << q.front() << "\n";
q.pop();
}
else {
cout << "-1" << "\n";
}
}
else if (command == "size") {
cout << q.size() << "\n";
}
else if (command == "empty") {
if (q.empty())
cout << "1" << "\n";
else
cout << "0" << "\n";
}
else if (command == "front") {
if (!q.empty()) {
cout << q.front() << "\n";
}
else {
cout << "-1" << "\n";
}
}
else if (command == "back") {
if (!q.empty()) {
cout << q.back() << "\n";
}
else {
cout << "-1" << "\n";
}
}
}
return 0;
}
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