What is the correct way to work with BufferedInputStream(System.in)?

Question

Java

There is a task: https://contest.yandex.ru/contest/8458/problems/C

To complete it, I wrote the following code:

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Mass {
    private static int count_mass = 11;                                               //  Длина считываемого числа

    public static void main(String[] args) throws IOException {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int count = Integer.parseInt(br.readLine());
        char[] el;
        char[] o_el = new char[] {'-','9','9','9','8',10};;       //  предыдущее считанное значение
        for (int i = 1; i <= count; i++){
            el = getBuf();
            if(!eq_mass(el, o_el)){
                print_buf(el);
            }
            o_el = el;
        }
        br.close();
    }

    //  Блок функций ------------------------------
    static void print_buf(char[] b){
        int l = 0;
        do {
            System.out.print(b[l]);
            l++;
        }while(b[l] != 10 && b[l] != 0);
        if (b[l] != 0) {
            System.out.print(b[l]);
        }
    }
    static char[] getBuf() throws IOException {                                     //  Считать массив из консоли
        char[] buf;
        buf = new char[count_mass];
        BufferedInputStream bf = new BufferedInputStream(System.in);

        try{
            int i, l = 0;
            char c = 1;
            while(c != 0 && c != 10 && ((i = bf.read()) != -1) ) {
                c = (char) i;
                buf[l] = c;
                l++;
            }
        }
        finally{
            //bf.close();
            return buf;
        }
    }

    static boolean eq_mass(char[] m1, char[] m2){                                   //  Сравнить массив
        boolean rez = true;                                                         //  по умолчанию массивы равны
        for (int i = 0; i < count_mass; i++) {
            if(m1[i] != m2[i]){
                rez = false;
            }
            if (m1[i] == 10 || m2[i] == 10){
                break;
            }
        }
        return rez;
    }
}

after sending this code, the testing system issues a verdict: "Invalid answer".

Perhaps I'm not working correctly with BufferedInputStream(System.in)? Can you tell me where is the mistake in my code?