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/*
****************************************************************
****************************************************************
-> Coded by Stavros Chryselis
-> Visit my github for more solved problems over multiple sites
-> https://github.com/StavrosChryselis
-> Feel free to email me at stavrikios@gmail.com
****************************************************************
****************************************************************
*/
#include <stdio.h>
#include <deque>
#include <string>
#include <ctype.h>
#define gc() getchar()
using namespace std;
inline void getstring(string &A)
{
char c = gc();
A.clear();
while (isspace(c))
c = gc();
while (!isspace(c) && c != EOF)
{
A.push_back(c);
c = gc();
}
}
deque<int> Q;
bool rev;
inline void tofront(int num)
{
if (rev)
Q.push_back(num);
else
Q.push_front(num);
}
inline void toback(int num)
{
if (rev)
Q.push_front(num);
else
Q.push_back(num);
}
inline void front()
{
if (Q.empty())
printf("No job for Ada?\n");
else
{
if (rev)
{
printf("%d\n", Q.back());
Q.pop_back();
}
else
{
printf("%d\n", Q.front());
Q.pop_front();
}
}
}
inline void back()
{
if (Q.empty())
printf("No job for Ada?\n");
else
{
if (rev)
{
printf("%d\n", Q.front());
Q.pop_front();
}
else
{
printf("%d\n", Q.back());
Q.pop_back();
}
}
}
inline void command()
{
string S;
int num;
getstring(S);
if (S == "toFront")
{
scanf("%d", &num);
tofront(num);
}
else if (S == "front")
front();
else if (S == "back")
back();
else if (S == "push_back")
{
scanf("%d", &num);
toback(num);
}
else
rev = !rev;
}
int main()
{
int N;
// freopen("input.txt", "r", stdin);
scanf("%d", &N);
while (N--)
command();
return 0;
}
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