룩
Time Limit: 1 SecMemory Limit: 1024 MiB
Example Input 1
a1 e7 3 a3 b7 d3
Example Output 1
good
Example Input 2
b3 b8 5 b6 b2 a2 a6 d1
Example Output 2
ambiguous
Example Input 3
b3 b8 5 d1 b6 b2 a2 a6
Example Output 3
impossible
Example Input 4
c2 f5 1 f5
Example Output 4
impossible