Sample input

2
11
47
1234567892
0
Output for sample input

2
2
2
2


import java.util.*;

public class UVA11332 {

 public static void main(String[] args) {

  Scanner sc = new Scanner(System.in);

  while (sc.hasNextInt()) {

   long n = sc.nextInt();

   if (n == 0)
    break;

   while (n / 10 > 0) {

    int sum = 0;

    while (n > 0) {
     sum += n % 10;

     n /= 10;
    }

    n = sum;
   }
   System.out.println(n);
  }

 }

}