# Complex numbers: addition and subtraction

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Two complex numbers are given. Find their sum or difference.

## Input

Each line contains an example of addition or subtraction of complex numbers. The complex number is given in the format $a+bi$ or $a−bi$, where $a$ is integer, $b$ is non-negative integer. The real and imaginary part of each complex number is no more than $10_{9}$ by absolute value.

## Output

For each input example, print in a separate line the answer.

## Examples

Input #1

Answer #1

Submissions 1K

Acceptance rate 43%