Two teams, Team ~A~ and Team ~B~, are playing a volleyball game. In volleyball, the first team to reach at least 25 points with a 2 point difference or more wins the game. A team gets a point when the ball lands on the opponent's side of the court or when the opponent hits the ball out of bounds. Create a program that determines which team won.

Input Specification

The only line of input will be a string which is made solely from the characters A and B. The letter represents a point gained by said team. A means that Team ~A~ scored a point; B means that Team ~B~ scored a point.

Output Specification

Print the letter of the team that won, or if the game is still ongoing, print Not finished instead.

Sample Input

AABAABBAABABABBBBAAABBABBBABBBBBABBABBBAB

Sample Output

B