import java.util.*;
import java.lang.*;

class l1SumDigits
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println("Enter a number consisting of up to 200 digits:");
		Scanner in = new Scanner(System.in);
		String input = in.nextLine();
		//check whether we got a correct input
		if (!input.matches("\\d{1,200}")) {
			System.out.println("Incorrect input");
			return;
		}
		int sum = 0;
		for (int i=0; i < input.length(); i++) {
			sum = sum + Integer.parseInt(String.valueOf(input.charAt(i)));
		}
		System.out.println("Sum of digits is " + sum);
	}
}