Don't know why I am getting WA...Here is my code....
#include<stdio.h>
#include<string.h>
int main()
{
long long i,j,k,s;
char n[1000];
while(1)
{
s=0;
scanf("%s",&n);
i=strlen(n);
if(n[0]=='0' && n[1]=='\0')
break;
for(j=0;j<i;j++)
{
s=s*10+n[j]-'0';
}
if(s%11==0)
printf("%lld is ...