Primary Arithmetic - Source Code JAVA

Children are taught to add multi-digit numbers from right to left, one digit at a time.

Many find the “carry” operation, where a 1 is carried from one digit position to the

next, to be a significant challenge. Your job is to count the number of carry operations

for each of a set of addition problems so that educators may assess their difficulty.

Input

Each line of input contains two unsigned integers less than 10 digits. The last line of

input contains “0 0”.

Output

For each line of input except the last, compute the number of carry operations that

result from adding the two numbers and print them in the format shown below.

Sample Input

123 456

555 555

123 594

0 0

Sample Output

No carry operation.

3 carry operations.

1 carry operation.

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