Poornimites are taught to add multi-digit numbers from right-to-left one digit at a time.
Many find the "carry" operation - in which 1 is carried from one digit position
to be added to the next - to be a significant challenge.  Your job is to
count the number of carry operations for each of addition problem so that educators may assess their difficulty.

For the input first line contains n number of records which is less then 1000. And then each line contains two numbers with spacing between them as shown in sample. 

SAMPLE INPUT
3
123 456
555 555
123 594

SAMPLE OUTPUT
No carry operation
3 carry operations
1 carry operation

Explanation

EXAMPLE 1:-

when the digits are added then there is no carry found as 3+6=9,2+5=7 and 1+4=5.

EXAMPLE 2:-

when the digits are added then carry is generated as 5+5 =10 so carry is found 3 times.

EXAMPLE 3:-

when the digits 9 and 2 are added only then carry is found so 1 time only.
for i in range(input()):
	a,b = map(list,raw_input().split())
	c,test=0,False
	for j in range(len(a)):
		if int(a[j]) + int(b[j]) >=10:
			test,c=True,c+1
		elif (int(a[j]) + int(b[j])==9 and test):
			test,c=False,c+1
		else: test=False
	if c==0:
		print "No carry operation"
	elif c==1:
		print "1 carry operation"
	else:
		print c,"carry operations"