#include<iostream>
using namespace std;
const int N=101;
int n,m,ans=0;
int a[N],b[N],choose[N][N];
void search(int x,int y)
{
if(x==n+1)
{
if(ans<y)
{
ans=y;
for(int i=1;i<=n;i++)
{
b[i]=a[i];
}
}
return ;
}
for(int i=1;i<x;i++)
{
if(choose[x][i]==1&&choose[i][x]==1&&a[i])
{
search(x+1,y);
return;
}
}
a[x]=1;
search(x+1,y+1);
a[x]=0;
search(x+1,y);
}
int main()
{
cin>>n>>m;
for(int i=1;i<=m;i++)
{
int x,y;
cin>>x>>y;
choose[x][y]=1;
choose[y][x]=1;
}
search(1,0);
cout<<ans<<endl;
for(int i=1;i<=n;i++)
{
cout<<b[i]<<' ';
}
return 0;
}