Replace Equals in Bold Text

Given an input string, replace every equals sign (=) that appears inside bold text (delimited by a pair of double asterisks **) with an underscore (_). Only the equals signs inside properly closed bold regions should be replaced. For example, the expression **3 + 5 = 8** should become **3 + 5 _ 8**. If a bold section is not properly closed, it is treated as regular text.

Be sure to process the input from standard input (stdin) and output the result to standard output (stdout).

inputFormat

The input consists of a single line string read from standard input (stdin). This string may contain one or more bold segments (delimited by '**').

outputFormat

Output the transformed string to standard output (stdout) after replacing equals signs with underscores inside the bold segments.

**Markdown** editing is fun.

**Markdown** editing is fun.