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#include <fstream>
using namespace std;
ifstream fin("6cai.in");
ofstream fout("6cai.out");
int x,m,i,v[100005],nr,last,first,top;
int main()
{
fin >> x >> m;
if (x<=100)
{
for (i=1; i<=m; i++)
{
fin >> nr;
if (nr!=0)
{
last++;
v[last]=nr;
}
else
{
first++;
fout << v[first] << '\n';
}
}
}
else
{
for (i=1; i<=m; i++)
{
fin >> nr;
if (nr!=0)
{
top++;
v[top]=nr;
}
else
{
fout << v[top] << '\n';
top--;
}
}
}
fin.close();
fout.close();
return 0;
}