#include <bits/stdc++.h>
using namespace std;
int main() {
int P, N;
cin >> P >> N;
if (P == 1) {
vector<int> a(N - 1);
vector<int> b(N - 1);
set<int> adj[N];
for (int i = 0; i < N - 1; ++i) {
cin >> a[i] >> b[i];
adj[a[i]].insert(b[i]);
adj[b[i]].insert(a[i]);
}
string message = "";
vector<int> l;
for(int j=0;j<N;j++) {
for (int i=0;i<N;i++) {
if(adj[i].size()==1) {
int x = *(adj[i].begin());
l.push_back(i);
if(x>i)message+="1";
else message+="0";
adj[i].erase(x);
adj[x].erase(i);
}
}
}
cout << message << endl;
for (int i = 0; i < N - 1; ++i) {
cout << l[i] << endl;
}
} else {
cin.ignore(100, '\n');
string message;
getline(cin, message);
for (int i = 0; i < N - 1; ++i) {
int a, b;
cin >> a >> b;
bool guess_a = true;
if(message[i]=='1') {
if(a<b)guess_a=true;
else guess_a=false;
}
else {
if(a<b)guess_a=false;
else guess_a=true;
}
if (guess_a) {
cout << a << endl;
} else {
cout << b << endl;
}
}
}
return 0;
}
