#include "stdio.h"
#include "string.h"
int main()
{
	long a,b,c;
	int i,p;
	while(scanf("%ld%ld",&a,&b)!=-1)
	{
		if(a==0&&b==0) break;
		c=a+b;
		for(i=0,p=0;i<11&&c!=0;i++)
		{
			if((a+b)%10 != c%10) p++;
			a/=10;
			b/=10;
			c/=10;	
		}
		if(p==0) printf("No ");
		else printf("%d ",p);
		if(p<2) printf("carry operation.\n");
		else printf("carry operations.\n");	
	}
	return 0;
}