import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

}
}
} import java.util.Scanner; Scanner java.util public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

}
}
} Main public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

}
} main {
Scanner sc = new Scanner(System.in);
while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

}
} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

} true {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

} String x= sc.next(); x sc.next() sc.next sc if (x.equals("0")) break; x.equals("0") x.equals x "0" break; int ans=0; ans 0 for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0'; int i=0; int i=0; i 0 i<x.length() i x.length() x.length x i++ i++ i ans += x.charAt(i)-'0'; ans += x.charAt(i)-'0' ans x.charAt(i)-'0' x.charAt(i) x.charAt x i '0' System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

}
}
} public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

}
}
} Main
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (true) {
String x= sc.next();

if (x.equals("0")) break;
int ans=0;
for(int i=0;i<x.length();i++)ans += x.charAt(i)-'0';
System.out.println(ans);

}
}
}
