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;
#define ll long long
#define pii pair <int, int>
#define fi first
#define se second
int a, b, c, d;
void ispisi(int x, int y) {
    cout << x << " " << y << "\n";
}
void solve1() {
    int x = 0, y = 0;
    for (int i = 0; i < b / 2; i++) {
         ispisi(x, y); y++;
    }
    ispisi(x, y); x++;
    for (int i = 0; i < (b - 1) / 2; i++) {
        ispisi(x, y); y--;
    }
    for (int i = 0; i < (a - 1) / 2; i++) {
        ispisi(x, y); x++;
    }
    ispisi(x, y); y--;
    for (int i = 0; i < a / 2; i++) {
        ispisi(x, y); x--;
    }
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> a >> b >> c >> d;
    if (c == 0 && d == 0) solve1();
    //if (a == b == 0) solve2();
    return 0;
}
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