#include <iostream>
#include <cmath>
#include <cstdio>
using namespace std;

const int MAXS = 10000;
const int MAXNM = 100;

bool repeated(int x[], int y[], int n)
{
	for(int i=0; i<n; i++)
		if (x[i] == x[n] && y[i] == y[n])
			return true;
	return false;
}

int main()
{
	int r, c, n, m;
	int x[MAXNM], y[MAXNM];
		cin >> r >> c >> n >> m;
		if (r < 1 || r > MAXS) {
			cout << "ERROR: incorrect number rows: " << r << endl; return 1;}
		if (c < 1 || c > MAXS) {
			cout << "ERROR: incorrect number columns: " << c << endl; return 2;}
		if (n < 0 || m < 0 || n+m > MAXNM) {
			cout << "ERROR: n, m: " << n << ',' << m << endl; return 3;}
		for(int i=0; i<n+m; i++) {
			cin >> x[i] >> y[i];
			if (x[i] < 0 || x[i] >= r) {
				cout << "ERROR: invalid row value for icon "<< i << ": " << x[i] << endl; return 4;}
			if (y[i] < 0 || y[i] >= c) {
				cout << "ERROR: invalid col value for icon "<< i << ": " << x[i] << endl; return 5;}
			if (repeated(x, y, i)) {
				cout << "ERROR: repeated icon position "<< i << ": " << x[i] << ',' << y[i] << endl; return 6;}
		}
return 42;
}