题目描述
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.
Example
Input
123
55
1000
0
Output
6
10
1
输入格式
见题面
输出格式
见题面
样例输入
123
55
1000
0
样例输出
6
10
1