bool solve()
{
int mg,mm;
while(!g.empty() && !m.empty())
{
mg=*g.begin();
mm=*m.begin();
if(mg<mm)
g.erase(g.begin());
else
m.erase(m.begin());
}
return m.empty();
}
int main(){
int N, n;
int count= 0;
scanf( "%d", &N );
for( int i= 1; i<= N; ++i )
toWrite.insert( i );
for( int i= 1; i<= N; ++i ){
scanf( "%d", &arr[i] );
if( !freq[arr[i]] )
toWrite.erase( arr[i] );
freq[arr[i]]++;
}
//for( auto it= toWrite.begin(); it!= toWrite.end(); ++it )
// cout << *it << " ";
//cout << endl;
for( int i= 1; i<= N; ++i ){
auto it= num.insert( arr[i] );
if( !it.ss || arr[i] > N ){
arr[i]= *(toWrite.begin());
toWrite.erase( arr[i] );
}
}
for( int i= 1; i<= N; ++i )
cout << arr[i] << " ";
return 0;
}
int main()
{
int n,m,x,y,i;
while(scanf("%d%d", &n, &m)!=EOF)
{
vs.clear();
for(i=0; i<n; ++i) v[i].clear();
for(i=0; i<m; ++i)
{
scanf("%d%d", &x, &y);
--x; --y;
v[x].push_back(y);
v[y].push_back(x);
}
for(i=0; i<n; ++i)
{
s1.insert(i);
sort(v[i].begin(), v[i].end());
}
while(!s1.empty())
{
x=*s1.begin();
s1.erase(x);
s2.clear();
q.push(x);
while(!q.empty())
{
x=q.front(); q.pop();
s2.insert(x);
for(sit=s1.begin(); sit != s1.end();)
{
y=*sit;
++sit;
if(!binary_search(v[x].begin(), v[x].end(), y))
{
q.push(y); s1.erase(y);
}
}
}
vs.push_back(s2);
}
printf("%u\n", vs.size());
for(i=0; i<vs.size(); ++i)
{
printf("%u", vs[i].size());
for(sit=vs[i].begin(); sit != vs[i].end(); ++sit)
{
printf(" %d", *sit+1);
}
puts("");
}
}
return 0;
}