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 - 1; ++i) {
            --y;
            print(x, y);
        }
    } else {
        int x = 0, y = 0;
        print(x, y);
        
        for (int i = 0; i < c / 2; ++i) {
            ++x, ++y;
            print(x, y);
        }
        
        for (int i = 0; i < d / 2; ++i) {
            --x, ++y;
            print(x, y);
        }
        
        for (int i = 0; i < c / 2; ++i) {
            --x, --y;
            print(x, y);
        }
        
        for (int i = 0; i < d / 2 - 1; ++i) {
            ++x, --y;
            print(x, y);
        }
    }
}
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