Lec_07

55

public class Numbers {

public BigInteger count(int x) {

if (x == 0)	return BigInteger.ZERO;
if (x == 1)	return BigInteger.valueOf(10);

return BigInteger.valueOf(10).multiply(count(x - 1));

}

public void main() throws Exception {

Scanner sc = new Scanner(new FileReader(INPUT_FILE)); int A = sc.nextInt();

int B = sc.nextInt(); sc.close();

PrintWriter pw = new PrintWriter(new FileWriter(OUTPUT_FILE)); pw.println(count(B).subtract(count(A - 1)));

pw.flush();

pw.close();

}

}

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