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Python: King move
pole55 (196)

Chess king moves one square in any direction. Given two different squares of the chessboard, determine whether a king can go from the first square to the second one in a single move.

The program receives four numbers from 1 to 8 each specifying the column and the row number, first two - for the first square, and the last two - for the second square. The program should output YES if a king can go from the first square to the second one in a single move or NO otherwise.