#include<cstdio>#include<cstring>#include<iostream>#include<algorithm>using namespace std;const int maxn=10e4+10;int a[maxn],num[maxn*10];int main(){ int n; while(scanf("%d",&n)&&n) {memset(num,0,sizeof(num));int k=0;for(int i=0;i<n;i++){ scanf("%d",&a[i]); num[a[i]]++; k=max(k,num[a[i]]);}sort(a,a+n);printf("%dn",k);for(int i=0;i<k;i++){ printf("%d",a[i]); for(int j=i+k;j<n;j+=k)printf(" %d",a[j]); printf("n");} } return 0;}
