Keywords less then 6 characters are sometimes repeated twice, so remember to check for that as well. Also, a password doesn't contain spaces, so be sure to check your input.

So is the condition "keywords less then 6 characters" checked before, or after spaces are removed?

Why input is string not a complex number?

The tests does not require checking for |z| < 2 for exactly n iterations; n+10 works too. There should be fixed tests to enforce this.