Problem:
Sum of Numbers

Write a program which reads an integer and prints sum of its digits.

Input

The input consists of multiple datasets. For each dataset, an integer x is given in a line. The number of digits in x does not exceed 1000.

The input ends with a line including single zero. Your program should not process for this terminal symbol.

Output

For each dataset, print the sum of digits in x.

Sample Input

123
55
1000
0

Sample Output

6
10
1

Solution in Ruby (judge verdict: Accepted)

def sum_of_d(a)
 if(a==0)
  return 0
 else
 return a%10+sum_of_d(a/10)
 end
end
while(1)
x=gets.to_i
if(x==0)
 break
end
print("#{sum_of_d(x)}\n")
end