A square on a chessboard is identified by two numbers (a, b) from 1 to 8. The first is the column, the second is the row. Given two squares, determine if a king can move from the first to the second in one move.
Four integers from 1 to 8 are given: the first two specify the starting square, the other two the target square. The start and end squares are different. Each number is on a separate line.
Output "YES" if the king can move from the first square to the second in one move, otherwise output "NO".
Input #1
4 4 5 5
Output #1
YES
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