Determine whether a bishop on a square with given coordinates (row and column) attacks a piece on another specified square.
Four numbers are entered: the coordinates of the bishop and the coordinates of another piece. Coordinates are integers from 1 to 8.
Output "YES" if the bishop can capture the piece in one move, otherwise output "NO".
Input #1
1 1 5 5
Output #1
YES
Input #2
3 2 2 2
Output #2
NO
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