Intervals (2) P56559

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

Input

Input consists of four integer numbers a₁, b₁, a₂, b₂ that represent the intervals [a₁,b₁] and [a₂,b₂]. Assume a₁≤ b₁ and a₂≤ b₂.

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.