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.
t = input()
for i in range(t):
	a,b = raw_input().split(' ')
	ln = len(a)
	cnt = 0
	crry = 0
	for i in range(ln):
		c = int(a[ln-i-1])+int(b[ln-i-1])+crry
		#print a,b,' ',c
		if c >= 10:
			crry = c%10
			cnt +=1
		else:
			crry = 0
	s = str(cnt) if cnt else 'No'
	g = s+ ' carry operation'+('s' if cnt>1 else '')
	print g