local n = io.read("*n", "*l")
local s, t = {}, {}
for i = 1, n do
  local tp, w = io.read():match("(%d) (%w)")
  if tp == "0" then
    table.insert(s, w)
  else
    table.insert(t, w)
  end
end
print(table.concat(t):reverse() .. table.concat(s))