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