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 <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
void print(int _x, int _y) { cout << _x << " " << _y << "\n"; }
int a, b, c, d;
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> a >> b >> c >> d;
if (c == d && c == 0) {
int x = 0, y = 0;
print(x, y);
for (int i = 0; i < a / 2; ++i) {
--x;
print(x, y);
}
for (int i = 0; i < b / 2; ++i) {
++y;
print(x, y);
}
for (int i = 0; i < a / 2; ++i) {
++x;
print(x, y);
}
for (int i = 0; i < b / 2; ++i) {
--y;
print(x, y);
}
}
cout << "-1";
}
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