wrong answer on test 1: case 2: operation 5: creates equal adjacent letters
input:
4
YDX
YDXDYX
YDY
YDXDYY
output:
YES
YDX
Y 0 D 1 X 2
YES
YDXDYX
D 0 Y 1 X 2
Y 0 D 1 X 2
NO
NO
exit status 1