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Time Limit: 3000/2000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)
Total Submission(s): 11275    Accepted Submission(s): 2451


Problem Description
 

Sample Input
8
I 2
I -1
I 1
Q 3
L
D
R
Q 2
 

Sample Output
2
3
 

Hint

The following diagram shows the status of sequence after each instruction:

 

Source
2013 Multi-University Training Contest 10
 

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