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
#include <cstdio>

int main(){
	char x[1001];
	while(1){
		int U=0, i=0;
	
		scanf("%s", x);
		if(x[0]=='0') break;
	
		while(x[i]!='\0'){
			U += x[i]-'0';
			++i;
		}
		
		printf("%d\n", U);
	}
	
	return 0;
}

