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ZOJ Problem Set - 2301
Color the Ball

Time Limit: 2 Seconds      Memory Limit: 65536 KB

There are infinite balls in a line (numbered 1 2 3 ....), and initially all of them are paint black. Now Jim use a brush paint the balls, every time give two integers a b and follow by a char 'w' or 'b', 'w' denotes the ball from a to b are painted white, 'b' denotes that be painted black. You are ask to find the longest white ball sequence.


First line is an integer N (<=2000), the times Jim paint, next N line contain a b c, c can be 'w' and 'b'.

There are multiple cases, process to the end of file.


Two integers the left end of the longest white ball sequence and the right end of longest white ball sequence (If more than one output the small number one). All the input are less than 2^31-1. If no such sequence exists, output "Oh, my god".

Sample Input

1 4 w
8 11 w
3 5 b

Sample Output

8 11

Author: ZHOU, Kai
Source: ZOJ Monthly, February 2005
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