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#include<stdio.h>
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#include<string.h>
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int main()
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{
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char a[20],b[20],e[20],d[20];
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int p,c,i,l,s,len,y,k,n,j;
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while(scanf("%s%s",a,b)==2)
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{
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k=(a[0]-'0');
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l=(b[0]-'0');
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if(k==0&&l==0)
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break;
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l=strlen(a);
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len=strlen(b);
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if(l>len)
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{
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y=l;
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n=l-len;
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for(i=0;i<n;i++)
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d[i]='0';
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for(i=i,j=0;j<len;i++,j++)
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d[i]=b[j];
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d[l]='\0';
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strcpy(e,a);
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}
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else if(l<len)
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{
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y=len;
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n=len-l;
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for(i=0;i<n;i++)
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e[i]='0';
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for(i=i,j=0;j<l;i++,j++)
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e[i]=a[j];
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e[len]='\0';
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strcpy(d,b);
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}
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else if(l==len)
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{
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y=l;
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strcpy(e,a);
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strcpy(d,b);
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}
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c=0;
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p=0;
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for(i=y;i>=0;i--)
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{
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s=(e[i]-'0')+(d[i]-'0');
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if(s>=10)
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{
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c++;
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e[i-1]++;
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}
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}
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if(c==0)
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printf("No carry operation.\n");
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else if(c==1)
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printf("1 carry operation.\n");
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else
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printf("%d carry operations.\n",c);
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}
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return 0;
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}
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