URI Online Judge | 1871
# Zero means Zero

**Timelimit: 1**

By Ricardo Martins, IFSULDEMINAS Brazil

One day Prof. Humberto José Roberto made the following question: If the zero to the left of a number has no value , why would other positions of a number? Analyzing as follows , it asks for your help , to add two integer values , the result is displayed according to his reasoning , that is, without the zeros . For example , to add 15 + 5, the result would be 20 , but with this new idea, the new result would be 2 , and to add 99 + 6 , the result would be 105, but with this new idea , the new result would be 15.

Write a program that , given two integers without the digit zero , some the same and, if the result has a zero digit, which remove them before display .

There will be several test cases . Each test case begins with two integers M and N ( 1 ≤ M ≤ N ≤ 999 999 999 ) .

The last test case is indicated when C = M = 0 , and this case should not be processed.

For each test case , print the sum of the two values without Zeros .

Input Sample | Output Sample |

7 8 15 5 99 6 0 0 |
15 2 15 |