#include <bits/stdc++.h>
int main(){

    deque <int> dq;
    dq.push_back(1);
    dq.push_back(2);
    dq.push_front(3);

    while(!dq.empty()){
        printf("%d\n",dq.front());
        dq.pop_front();
    }


    return 0;
}