#include <iostream>
#include <vector>
#include<queue>
using namespace std;
vector <int> t;
vector <vector <int>> v;
queue <int> q;
vector <int> vis;
int main() {
int a,b,c,x,y;
cin>>a>>b>>c;
t.resize(b);
v.resize(b);
vis.resize(b);
for(int i=0;i<b;i++)
{
cin>>x>>y;
v[x].push_back(y);
}
for(int i=0;i<b;i++)
{
for(int j=0;j<v[i].size();j++)
{
q.push(v[i][j]);
}
}
for(int i=0;i<q.size();i++)
{
cout<<q.front()<<' ';
q.pop();
}
}
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