STOLEN PICTURES
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There has been a robbery at a local museum. Security experts have determined that
the robbery took place during a 5 minute period when the fire alarm went off, 
12:20-12:25 pm. The security camera tapes have been analyzed using modern image 
processing algorithms. You are given the output of this analysis in the form of 
who entered or left the museum and when. Your job is to use this data to identify 
the robber.

Input

There are n sets of input. Your program must produce a line of output for each 
case. The first line of the input is the number of cases n.

This is followed by any number of entrance or exit records in the form "person 
action time" (see the 'Sample Input' section below). The list of 
exit/entrance records is terminated by a line containing a single 0. The next 
input starts from the next line onwards.

For simplicity assume that the people are numbered 1 through n (n < 1000). All
entry and exit times are integers. Times go from 0 to 23. You may also assume 
that the inputs will be such that there will be at least one person in the 
building between 12 and 1.

Output

If there was only one person in the building at the time of the robbery, then 
identify him as the robber. If there was more than one person, the robber cannot
be determined and so your program should output the phrase "Ambiguous input".

Sample Input

2
1 enters 9
2 enters 9
1 leaves 10
3 enters 10
2 leaves 11
3 leaves 13
0
1 enters 9
2 enters 9 
1 leaves 10
3 enters 10
1 enters 11
2 leaves 11
3 leaves 13
1 leaves 14
0

Sample Output

3 is guilty
Ambiguous input