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Problem 1046. -- Primary Arithmetic ## Primary Arithmetic

Time Limit: 1 Sec Memory Limit: 64 MB

Submit: 43 Solved: 11

[Submit][Status][Discuss]## Description

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.

## HINT

## Source

Waterloo local 2000.09.23

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