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 C (judge verdict: Time Limit Exceeded)

#include<stdio.h>
int main(){
int x,i,sum=0;
char ch[1001];
scanf("%d\n",&x);
while(1){
scanf("%s\n",&ch);
if(ch[0]=='0')break;
while(1){
if(ch[i]=='\0')break;
if(ch[i]=='1')sum+=1;
else if(ch[i]=='2')sum+=2;
else if(ch[i]=='3')sum+=3;
else if(ch[i]=='4')sum+=4;
else if(ch[i]=='5')sum+=5;
else if(ch[i]=='6')sum+=6;
else if(ch[i]=='7')sum+=7;
else if(ch[i]=='8')sum+=8;
else if(ch[i]=='9')sum+=9;
}
printf("%d\n",sum);
sum=0;
}
return 0;
}