NYOJ小学生算数

#include <stdio.h> 
int main (){
int a,b,c,d[8],e,f;
while (scanf("%d%d",&a,&b)!=EOF){
if (b==0&&a==0)
break;
f=0;
d[0]=a%10;
d[1]=a/10%10;
d[2]=a/100;
d[3]=b%10;
d[4]=b/10%10;
d[5]=b/100;
for(e=0;e<=2;e++){
if(d[e]+d[e+3]>=10){
f++;
d[e+1]++;
}
}
printf("%d\n",f);
} 
return 0;
}