while True:
try:
a,b=map(int,input().split())
count=0
carry=0
if a==b==0:
break
while a!=0 or b!=0:
if a%10+b%10+carry>9:
count+=1
carry=1
a//=10
b//=10
if count==0:
print('No carry operation.')
elif count==1:
print('1 carry operation.')
else:
print(str(count)+' carry operations.')
except:
break
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