Again, simply do what it tells you. For information on the inverse modulo a prime, check out my notes here!
from string import ascii_lowercase, digitsfrom Crypto.Util.number import inversenumbers = [268,413,438,313,426,337,272,188,392,338,77,332,139,113,92,239,247,120,419,72,295,190,131]alphabet =' '+ ascii_lowercase + digits +'_'# space at front because letters start at index 1!flag =''for n in numbers: idx =inverse(n %41, 41) flag += alphabet[idx]print(flag)# picoCTF{1nv3r53ly_h4rd_8a05d939}