import java.io.IOException;

public class InputStreamDemo2 {
	public static void main(String[] args) {

		//Read digits that spell out an integer value.
		//For example, the digits "123" spell out the number 123.

		try {
			int sum = 0;
			int i;
			while ((i = System.in.read()) != -1 &&
				Character.isDigit(i)) {
				sum *= 10;
				sum += Character.getNumericValue(i);
			}
			System.out.println("sum == " + sum);
		}

		catch (IOException e) {
			System.err.println(e.getMessage());
		}
	}
}