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Problems

Complex numbers: addition and subtraction

Complex numbers: addition and subtraction

Time limit 1 second
Memory limit 128 MiB

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

Input data

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 data

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

Examples

Input example #1
2+3i + 7-4i
12-4i - 5-4i
-1-1i - -1-1i
5-2i - -7+12i
Output example #1
9-1i
7+0i
0+0i
12-14i
Author Michael Medvedev