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>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("fast-math")
//#pragma GCC optimize("no-stack-protector")
#define F first
#define S second
#define sz(x) int(x.size())
#define pb push_back
#define N 101001
#define M ll(998244353)
#define inf 1e9 + 1e9
using namespace std;
//using namespace __gnu_pbds;
typedef long double ld;
typedef long long ll;
typedef short int si;
typedef array <int, 3> a3;
//typedef tree <int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
int main()
{
    //freopen("input.txt", "r", stdin); //freopen("output4.txt", "w", stdout);
    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    if (c + d == 0)
    {
        int x = 0, y = 0;
        cout << 0 << " " << 0 << endl;
        for (int i = 0; i < a / 2; i++) {x++; cout << x << " " << y << endl;}
        for (int i = 0; i < b / 2; i++) {y--; cout << x << " " << y << endl;}
        for (int i = 0; i < a / 2; i++) {x--; cout << x << " " << y << endl;}
        for (int i = 0; i < b / 2 - 1; i++) {y++; cout << x << " " << y << endl;}
        exit(0);
    }
    else
    {
        cout << 0 << " " << 0 << endl;
        int x = 0, y = 0;
        for (int i = 0; i < c / 2; i++)
        {
            x++; y++;
            cout << x << " " << y << endl;
        }
        for (int i = 0; i < d / 2; i++)
        {
            x++; y--;
            cout << x << " " << y << endl;
        }
        for (int i = 0; i < c / 2; i++)
        {
            x--; y++;
            cout << x << " " << y << endl;
        }
        for (int i = 1; i < d / 2; i++)
        {
            x--; y--;
            cout << x << " " << y << endl;
        }
        exit(0);
    }
}
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