Write a program that, given two intervals, tells if one is inside the other.

Input

Input consists of four integer numbers a_{1}, b_{1}, a_{2}, b_{2}
that represent the intervals [a_{1},b_{1}] and [a_{2},b_{2}].
Assume a_{1}≤ b_{1} and a_{2}≤ b_{2}.

Output

Print ‘=’ if the intervals are equal, ‘1’ if the first is inside the second (but they are not equal), ‘2’ if the second is inside the first (but they are not equal), or ‘?’ otherwise.

Public test cases

**Input**

20 30 10 40

**Output**

1

**Input**

10 20 10 20

**Output**

=

**Input**

20 30 10 20

**Output**

?

**Input**

10 20 30 40

**Output**

?

Information

- Author
- Salvador Roura
- Language
- English
- Translator
- Carlos Molina
- Original language
- Catalan
- Other languages
- Catalan
- Official solutions
- C++ Java Python
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