lcstring

You are given a sequence $A=[A_1,A_2,\cdots,A_N]$ of length $N$ and a sequence $B=[B_1,B_2,\cdots,B_M]$ of length $M$.

Print any longest sequence that occurs contiguously in both $A$ and $B$. In other words, the printed sequence must equal an interval of $A$ and an interval of $B$.

The input is given in the following format:

$T$ $\mathrm{case}_1$ $\mathrm{case}_2$

For each case, print the length $K$ of a longest common interval on one line. If $K>0$, print its $K$ elements separated by spaces on the next line. If $K=0$, print no elements.

If several answers exist, you may print any of them.

• $1\leq T\leq100\,000$.
• $1\leq N,M\leq2000$.
• $$ ().