"substring('abcba') should return 'bcb'" this is wrong. "abba" use only 2 chars and got 4 long string.

Ok, found myself the problem, fixed :)

Im having problems with the third "online" test. sum values that are numbers and are between the minimum and maximum.

After a lot of time learning how this works, i finally managed to get everthing in place, but in the third test the filter decorator is nowhere to be found. Is like if the test dont have that filter, hopping for the program to remember from the second test???