CF1173A.Nauuo and Votes

Nauuo is a girl who loves writing comments.

One day, she posted a comment on Codeforces, wondering whether she would get upvotes or downvotes.

It's known that there were $x$ persons who would upvote, $y$ persons who would downvote, and there were also another $z$ persons who would vote, but you don't know whether they would upvote or downvote. Note that each of the $x+y+z$ people would vote exactly one time.

There are three different results: if there are more people upvote than downvote, the result will be "+"; if there are more people downvote than upvote, the result will be "-"; otherwise the result will be "0".

Because of the $z$ unknown persons, the result may be uncertain (i.e. there are more than one possible results). More formally, the result is uncertain if and only if there exist two different situations of how the $z$ persons vote, that the results are different in the two situations.

Tell Nauuo the result or report that the result is uncertain.

Nauuo 是一位喜欢写评论的女孩。

一天，她在 Codeforces 上发布了一条评论，思考自己会收到点赞还是点踩。

已知有 $x$ 个人会点赞，$y$ 个人会点踩，此外还有 $z$ 个人会投票，但你并不知道他们究竟会点赞还是点踩。注意：这 $x+y+z$ 个人每人恰好投一次票。

共有三种不同的结果：如果点赞人数多于点踩人数，则结果为 "+"；如果点踩人数多于点赞人数，则结果为 "-"；否则（即点赞人数等于点踩人数）结果为 "0"。

由于这 $z$ 个未知投票者的影响，最终结果可能不确定（即存在多种可能的结果）。更准确地说，当且仅当存在两种关于这 $z$ 个人投票方式的不同情形，使得这两种情形下得到的结果不同，此时结果才被视为不确定。

请告诉 Nauuo 最终结果，或报告该结果不确定。

The only line contains three integers $x$, $y$, $z$ ($0\le x,y,z\le100$), corresponding to the number of persons who would upvote, downvote or unknown.

唯一一行包含三个整数 $x$、$y$、$z$（$0\le x,y,z\le100$），分别表示将要点赞、点踩或状态未知的人数。

If there is only one possible result, print the result : "+", "-" or "0".

Otherwise, print "?" to report that the result is uncertain.

如果只有一个可能的结果，请输出该结果：“+”、“-”或“0”。

否则，输出“?”以表示结果不确定。

In the first example, Nauuo would definitely get three upvotes and seven downvotes, so the only possible result is "-".

In the second example, no matter the person unknown downvotes or upvotes, Nauuo would get more upvotes than downvotes. So the only possible result is "+".

In the third example, Nauuo would definitely get one upvote and one downvote, so the only possible result is "0".

In the fourth example, if the only one person upvoted, the result would be "+", otherwise, the result would be "-". There are two possible results, so the result is uncertain.

在第一个例子中，Nauuo 必然获得三次点赞和七次点踩，因此唯一可能的结果是“-”。

在第二个例子中，无论那位未知人士点赞还是点踩，Nauuo 获得的点赞数都严格多于点踩数。因此唯一可能的结果是“+”。

在第三个例子中，Nauuo 必然获得一次点赞和一次点踩，因此唯一可能的结果是“0”。

在第四个例子中，若唯一那位未知人士选择点赞，则结果为“+”；否则结果为“-”。存在两种可能结果，因此结果不确定。