import java.util.*;

class DigitFreq {
    int[] digitFreq(int n) {
        int[] freqs = new int[10];
        assert Arrays.equals(freqs, new int[]{0,0,0,0,0,0,0,0,0,0});
        assert n>=0;
        
        int m=n;
        // special case
        if (m==0) { freqs[0] += 1; }
        while (m>0) {
            int d = m % 10;
            assert 0<=d && d<10;
            freqs[d] += 1;
            m /= 10;
        }
        
        return freqs;
    }
    
    public static void main(String[] args) {
        DigitFreq df = new DigitFreq();
        for (int i: new int[] {0, 222226, 10, 1024} ) {
            System.out.println(i + ": "+ Arrays.toString(df.digitFreq(i)));
        }
        //System.out.println(10 + ": "+ df.digitFreq(10));
        //System.out.println(1024 + ": "+ df.digitFreq(1024));

    }   
}