#include <iostream> #include <cstdio> using namespace std ; int a [21] ; int main ( ) { int n = 0 ; int t ; while ( cin >> t ) { n ++ ; a [t] ++ ; } cout << n << endl ; for ( int i = 0 ; i <= 20 ; i ++ ) { cout << a [i] << ' ' ; } return 0 ; }