#include <bits/stdc++.h>
using namespace std;
const int N = 1e2 + 5;
int n,m;
struct point
{
    long double x,y;
    bool isKnown = 1;
};
vector<int> adj[N];
signed main()
{

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> m;
    vector<point> v(n);

    for(int i = 0; i < n; i++)
    {
        long double x,y;
        cin >> x >> y;
        if(x == -1 && y == -1)
            v[i].x = 0, v[i].y = 0, v[i].isKnown = 0;
        else
            v[i].x = x, v[i].y = y;
    }

    for(int i = 0; i < m; i++)
    {
        int u,v;
        cin >> u >> v;
        u--, v--;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    for(int iter = 0; iter < 1e5; iter++)
    {
        for(int  i = 0; i < n; i++)
        {
            if(v[i].isKnown)
                continue;

            long double smx = 0, smy = 0;
            
            for(auto j : adj[i])
                smx += v[j].x, smy += v[j].y;
            
            v[i].x = smx / adj[i].size(), v[i].y = smy / adj[i].size();
        }
    }

    for(int  i = 0; i < n; i++)
        cout << v[i].x << ' ' << v[i].y << '\n';
 
}