include <bits/stdc++.h>

using namespace std;

int b[20+1]; int i,temp,sum;

int main() {

while (scanf("%d",&temp)==1)
{
    b[temp]++;
    ++sum;
}
cout<<sum<<endl;
for (i=0;i<=20; i++)
    printf("%d",b[i]);
return 0;

}