Can you explain a small part of the code?

Question

Python

Here is the code from internet

s = input()
i = 0
count = 1
out = ''
while i< (len(s) - 1):
    if s[i] == s[i+1]:
        count += 1
    else:
        out = out + s[i] + str(count)
        count = 1
    i +=1
print(out+ s[i] + str(count)

Well, here it is subtracted from len (s) odnerka
Can you please explain in simple words, I’m just learning python and I don’t understand it, they say through the python visualizer to see I don’t understand anything
Please explain in simple words

Answer 1

Indexes start from zero.