Problem B: 华小科的旅行开始了

Problem B: 华小科的旅行开始了

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Time Limit : 1.000 sec  Memory Limit : 128 MiB

SubmitProblemListSolved: 6Submit Num: 12StatisticsShowOff!

Description

Input

Output

Sample Input Copy 

3 3 1 1
1 2 1 3 2 1
2 2 0 0 2 3
3 2 3 3 1 1

Sample Output Copy 

1 1
1 2
1 3
2 1
2 2

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