Maximum Difference

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Chef has just started learning about integers today. His friend Chefina gave him four integers $A$, $B$, $C$, and $D$. She asked him to choose two integers $P$ and $Q$ such that $A \leq P \leq B$ and $C \leq Q \leq D$ and find the maximum possible value of $P$ $-$ $Q$. Since Chef is weak in Maths, can you help Chef win this challenge? ### Input - First line will contain 4 integers, $A$, $B$, $C

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solution.cppC++17

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