#include <fstream>
using namespace std;
ifstream fin("date.in");
ofstream fout("date.out");

int A[50][50];
int n,m;
int p[50];

void citire()
{
   int x,y,i;
   fin>>n>>m;
   for(i=1;i<=m;i++)
   {
       fin>>x>>y;
       A[x][y]=A[y][x]=1;
   }
}

int  BF(int s)
{
    int st,dr,i,x[50],j;
    st=dr=1;
    p[s]=1;
    x[1]=s;
    while(st<=dr)
    {
        for(i=1; i<=n; i++)
        if(A[x[st]][i]!=0)
         {
            if(!p[i])
                {
                    dr++;
                    x[dr]=i;
                    p[i]=1;
                    A[x[st]][i]=A[i][x[st]]=0;
                }
            else return 1;
         }
         st++;
    }
    return 0;
}

int main()
{
    citire();
    if(m<3) fout<<"nu contine ciclu";
    else if (m>=n)  fout<<"contine ciclu";
    else
    {		
    int gasit=0;
    for(int i=1;i<n;i++) if(BF(i)) gasit=1;
    if(gasit) fout<<"contine ciclu";
    else fout<<"nu contine ciclu";
    }
    fin.close();
    fout.close();
    return 0;
}