#include<iostream> #include<cstdio> using namespace std; int b[21]; int main(){ //freopen("statistics.in","r",stdin); //freopen("statistics.out","w",stdout); int a,p=0; while(cin>>a){ b[a]++; p++; } cout<<p<<endl; for(int i=0;i<=20;i++){ cout<<b[i]<<' '; } }