Any resemblance to any real championship and sport is accidental.
The Berland National team takes part in the local Football championship which now has a group stage. Let's describe the formal rules of the local championship:
In the group stage the team's place is defined by the total number of scored points: the more points, the higher the place is. If two or more teams have the same number of points, then the following criteria are used (the criteria are listed in the order of falling priority, starting from the most important one):
The Berland team plays in the group where the results of 5 out of 6 games are already known. To be exact, there is the last game left. There the Berand national team plays with some other team. The coach asks you to find such score X:Y (where X is the number of goals Berland scored and Y is the number of goals the opponent scored in the game), that fulfills the following conditions:
The input has five lines.
Each line describes a game as "team_{1} team_{2} goals_{1}:goals_{2}" (without the quotes), what means that team team_{1} played a game with team team_{2}, besides, team_{1} scored goals_{1} goals and team_{2} scored goals_{2} goals. The names of teams team_{1} and team_{2} are non-empty strings, consisting of uppercase English letters, with length of no more than 20 characters; goals_{1}, goals_{2} are integers from 0 to 9.
The Berland team is called "BERLAND". It is guaranteed that the Berland team and one more team played exactly 2 games and the the other teams played exactly 3 games.
Print the required score in the last game as X:Y, where X is the number of goals Berland scored and Y is the number of goals the opponent scored. If the Berland team does not get the first or the second place in the group, whatever this game's score is, then print on a single line "IMPOSSIBLE" (without the quotes).
Note, that the result score can be very huge, 10:0 for example.
AERLAND DERLAND 2:1
DERLAND CERLAND 0:3
CERLAND AERLAND 0:1
AERLAND BERLAND 2:0
DERLAND BERLAND 4:0
6:0
AERLAND DERLAND 2:2
DERLAND CERLAND 2:3
CERLAND AERLAND 1:3
AERLAND BERLAND 2:1
DERLAND BERLAND 4:1
IMPOSSIBLE
In the first sample "BERLAND" plays the last game with team "CERLAND". If Berland wins with score 6:0, the results' table looks like that in the end:
In the second sample teams "AERLAND" and "DERLAND" have already won 7 and 4 points, respectively. The Berland team wins only 3 points, which is not enough to advance to the next championship stage.
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