#include<bits/stdc++.h>
//#include<atcoder/all>
using namespace std;
//using namespace atcoder;
#define rep(i,n) for(ll i=0; i<n; i++)
#define rrep(i,n) for(ll i=n-1; i>=0; i--)
#define print(a) cout<<a<<endl
typedef long long ll;
#define yn(flg) if(flg){cout<<"Yes"<<endl;}else{cout<<"No"<<endl;}
#define YN(flg) if(flg){cout<<"YES"<<endl;}else{cout<<"NO"<<endl;}
#define so(a) sort(a.begin(),a.end())
#define mp make_pair
#define vi vector<int>
#define vl vector<ll>
#define vs vector<string>
#define pb push_back
#define a2i(a,s) (ll)(a-s)
#define i2a(s,a) (char)(s+a)
#define ssize(a) a.size()
typedef pair<int, int> Pii;
typedef pair<int, ll> Pil;
typedef pair<pair<ll,ll>,ll> P3;
typedef pair<pair<ll,ll>,pair<ll,ll>> P4;
typedef pair<ll, ll> Pll;
typedef pair<ll,Pll> Plll;
typedef pair<Pii, int> Piii;
const ll INF = 1000000000000000000;
template<class T> inline bool chmin(T& a, T b) {
if (a > b) {
a = b;
return true;
}
return false;
}
template<class T> inline bool chmax(T& a, T b) {
if (a < b) {
a = b;
return true;
}
return false;
}
vector<int> g[200009];
void MakeMove(int v){
cout<<v<<endl;
}
int GetMove(){
ll v;
cin>>v;
return v;
}
int main(){
//入力
cin.tie(0);
ios::sync_with_stdio(0);
int n,m;
cin>>n>>m;
vector<pair<int,int> > edges(m);
rep(i,m){
cin>>edges[i].first>>edges[i].second;
}
for(ll i=0;i<m;i++){
int a=edges[i].first,b=edges[i].second;
g[a].push_back(b);
g[b].push_back(a);
}
vector<int> visited(n+1);
bool b=true;
// if(g[1].size()==0)b=false;
visited[1]=1;
for(ll i=0;i<g[1].size();i++){
if(visited[g[1][i]]==0){
queue<Pll> que;
que.push({1,g[1][i]});
while(!que.empty()){
Pll p=que.front();
que.pop();
ll re=p.first;
ll pos=p.second;
visited[pos]=1;
if(g[pos].size()==1){
b=false;
break;
}
for(auto nx:g[pos]){
if(nx!=re&&nx==1)break;
if(nx!=re&&visited[nx]>0){
b=false;
break;
}
if(nx!=re&&visited[nx]==0)que.push({pos,nx});
break;
}
if(b==false)break;
}
}
if(b==false)break;
}
if(b==false){
cout<<"NO"<<endl;
// cout<<1<<endl;
return 0;
}
cout<<"YES"<<endl;
while(1){
ll NX=GetMove();
if(NX==0)return 0;
ll p=1;
MakeMove(NX);
bool t=true;
while(1){
for(auto nx:g[NX]){
if(nx!=p){
MakeMove(nx);
p=NX;
NX=nx;
if(nx==1){
t=false;
}
break;
}
}
if(t==false)break;
}
}
return 0;
}
