We received a report and found that the judge contained an error, so we fixed it and performed a rejudge. (Around 20:30, 2020 10/26)

We have confirmed that the judge results of submissions made during the contest did not change.

We apologize for the inconvenience.

Note

This problem is designed so that it can be AC'd using only the information in the problem statement below.

In particular, there is no need to make multiple submissions. Please be considerate of the judge.

Also, there is no need to examine the image in the problem statement with editing software or the like.

Problem Statement

A certain $1$ problem was printed across $2$ pages, producing a set of problem sheets consisting of $2$ sheets.

Because they were not handled well, these problem sheets seem to have been torn into several pieces. Moreover, some of the pieces have disappeared.

The remaining pieces are gathered in the following image. Infer the original problem from them and somehow get AC.

However, the prepared test cases, including the samples of the original problem, are shuffled. (For example, test_00.in is not necessarily Sample 1.)