Complex numbers: addition and subtraction

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 an integer, $b$ is a 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