Simulate a cinema ticketing system. The theater has 100 rows of 99 seats (note No. 1 movie theater seat is in the middle) operation: B to buy the movie tickets, the format B < Arranging> < Start seat number> < end of the seat number> attention should be consecutive odd or even number. R said that refund, the format R < Arranging> < Start seat number> < end of the seat number> F indicates that the query, the format F < Arranging> < Start seat number> < end of the seat number> out the situation of these seats (X said that it has sold, unsold, said =) E, said operating end of the

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