This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
using namespace std;
int cnt[200001], N, M, u;
int main(){
	cin >> N >> M;
	for(int i = 0; i < 2 * (N + M - 1); i++){
		cin >> u;
		if(cnt[u] > 0) cout << cnt[u] << " 1" << endl;
		cnt[u]++;
	}
	return 0;
}
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