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1 #include<stdio.h> 2 #include<string.h> 3 #include<stdlib.h> 4 int main() 5 { 6 char s[10000]; 7 int i,num,b; 8 while(scanf("%s",s)!=-1) 9 { 10 b=atoi(s); 11 if(b==0) 12 break; 13 num=0; 14 for(i=0;s[i]!='\0';i++) 15 16 num=(num+(s[i]-'0'))%9; 17 if(num>0) 18 printf("%d\n",num); 19 else 20 printf("9\n"); 21 } 22 return 0; 23 }