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#include <bits/stdc++.h>
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using namespace std;
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struct Point {
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    int x, y;    
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};
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double distance(Point A, Point B) {
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    return sqrt((B.x - A.x) * (B.x - A.x) + (B.y - A.y) * (B.y - A.y));
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}
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bool cmp(Point A, Point B) {
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    return (distance(A, {0, 0}) < distance(B, {0, 0}));
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}
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int main() {
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    std::ios_base::sync_with_stdio(false);
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    cin.tie(0);
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    cout.tie(0);
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    int n;
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    cin >> n;
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    Point a[n];
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    for (int i = 0; i < n; ++i) {
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        cin >> a[i].x >> a[i].y;
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    }
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    sort(a + 0, a + n, &cmp);
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    for (int i = 0; i < n; ++i) {
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        cout << a[i].x << " " << a[i].y << endl;
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    }
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    return 0;
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}
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