#include 
#include 
#include 
using namespace std;
int main()
{
    int a,b,x,y;
    cin>>b;
    cin>>a;
    vectorpar[b];
    int boja[b];
    for(int i=0;i>x>>y;
        par[x].push_back(y);
        par[y].push_back(x);
    }
    for(int i=0;iQ;
    Q.push(0);
    boja[0]=0;
    while(!Q.empty())
    {
        int teme=Q.front();
        Q.pop();
        if(t==true)
        {
            cout<<"NO";
            return 0;
        }
        for(int i=0;i