stack

const size = 100000;
var stack:array[1..size] of longint;
    i,j,n,e,b,a:longint;
procedure push(a:longint);
 begin
  inc(e); stack[e]:=a;
 end;
procedure pop;
 begin
  dec(e);
 end;
Begin
read(n);
for i:=1 to n do
 begin
  read(a); push(a);
 end;
end.