10922 2 the 9s

#include<stdio.h>
#include<string.h>

int main()
{
     char ary[9000];
     int sum,i,len,n,a,b,c;
     while(gets(ary))
     {
    if((ary[0]=='0')&&(ary[1]=='\0'))
        break;
    c=0;
    sum=0;
    len=strlen(ary);
    for(i=0;i<len;i++)
        sum=sum+(ary[i]-48);

    if(sum%9==0)
    {
    if(sum!=9)
        c=1;
    do
    {
    n=sum;
    sum=0;

    while(n!=0)
    {
        a=n%10;
        b=n/10;
        n=b;
        sum=sum+a;
    }
    c=c+1;
    }while(sum>10);
    printf("%s is a multiple of 9 and has 9-degree %d.\n",ary,c);
    }
    else
        printf("%s is not a multiple of 9.\n",ary);
     }
     return 0;
}