Help with extracting characters from string

[Pedroski55]

Well, DeaD_EyE does it cooler!

Interesting however!

# shortcut to the first 2 places
result = [s[0], s[1]]
diff = 1
for l in range(2, len(s)):
    diff +=l
    if len(s) < diff:
        break
    result.append(s[diff])
    restring = ''.join(result)
    print(restring)