import  java.util.Random;


class Obraz {

    private int size_n;
    private int size_m;
    private char[][] tab;
    private int[] histogram;
    private int charForThreads = 0;




    public Obraz(int n, int m) {

        this.size_n = n;
        this.size_m = m;
        tab = new char[n][m];

        final Random random = new Random();

        for(int i=0;i<n;i++) {
            for(int j=0;j<m;j++) {
                tab[i][j] = (char)(random.nextInt(94)+33);  // ascii 33-127
                System.out.print(tab[i][j]+" ");
            }
            System.out.print("\n");
        }
        System.out.print("\n\n");

        histogram = new int[94];


        clear_histogram();
    }



    public void clear_histogram(){

        for(int i=0;i<94;i++) histogram[i]=0;

    }

    public void calculate_histogram(){

        for(int i=0;i<size_n;i++) {
            for(int j=0;j<size_m;j++) {

                for(int k=0;k<94;k++) {
                    if(tab[i][j] == (char)(k+33)) histogram[k]++;
                }

            }
        }

    }

    public void print_histogram(){

        for(int i=0;i<94;i++) {
            System.out.print((char)(i+33)+" "+histogram[i]+"\n");
        }

    }
    public String getValueAtChar(char c)
    {
        String sign = "";
        int value = histogram[(int) (c-33)];
        for(int i = 0; i<value;i++){
            sign +="=";
        }
        return sign;
    }

    public synchronized String getNextChar()
    {
        if (charForThreads == 94){
            return null;
        }
        int value = histogram[charForThreads];
        String sign = (char)(charForThreads + 33) + " ";
        for (int i = 0; i < value; i++) {
            sign += "=";
        }
        charForThreads++;
        return sign;
    }


}