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

public class Main {
	public static void main(String[] args)throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		long sum = 0;

		while(true){
			sum = 0;
			String str = br.readLine();
			if(str.length() >= 1){
				if(str.equals("0")){
					break;
				}
				for(int i = 0; i < str.length(); i++){
					sum += Integer.parseInt(String.valueOf(str.charAt(i)));
				}
			}
			System.out.println(sum);
		}
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz