Marichka will visit HackerLand, the country with $N$ ($1 \le N \le 10^{5}$) cities, on her spring holidays. She feels very excited because of this. 

During the next $Q$ days one of the two following events happens. 

- $1$ $U$ $V$ $P$ ($1 \le U \le N, 1 \le V \le N, 1 \le P \le 10^{9}$) --- hackers build a new bidirectional road with happiness points $P$ between cities $U$ and $V$ 

- $2$ $U$ $V$ ($1 \le U \le N , 1 \le V \le N$) --- Your task is to answer the query. You are given cities numbers --- $U$ and $V$, and your task is to find maximum happiness Marichka can get after travelling in some way(maybe through some intermediate cities) between cities $U$ and $V$. If there is no way to get from the city $U$ to the city $V$ between them, then simply output -1.

If Marichka's happiness before traversing some road was $X$ and road's happiness points are $Y$, then after traversing it Marichka's happiness will be equal to $X \oplus Y$.  Marichka can traverse one road many times. She also can visit some city many times during her travel.

Initially, there are no roads in HackerLand.

Input format

The first line consists of two integers $N$ and $Q$ ($1 \le N \le 10^{5}, 1 \le Q \le 10^{5}$)~--- the number of cities and the number of days, respectively.
Next $Q$ lines contain information about events in the format described above.

Output format

For each query of the second type, print only one integer in the single line --- maximum happiness Marichka can get after travelling in some way between cities $U$ and $V$. It is guaranteed that there exists at least one such query.