public class Main {
    public static void main(String args[]) throws java.io.IOException {
        byte[] buffer = new byte[16 * 1024];
        int currentNumber = 0;
        boolean inNumber = false;
        int read;
        while((read = System.in.read(buffer)) >= 0) {
            for (int i = 0; i < read; i++) {
                char c = (char) buffer[i];
                if (c >= '0' && c <= '9') {
                    inNumber = true;
                    currentNumber = currentNumber * 10 + (c - '0');
                } else if (inNumber) {
                    inNumber = false;
                    System.out.println("I've read number: " + currentNumber);
                    currentNumber = 0;
                }
            }
        }
    }
}

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7 3
1
51
966369
7
9
999996
11