a = "aaaabbсaa"
res = []
curr = a[0]
counter = 1
for i in a[1:]:
    if i == curr:
        counter += 1
    else:
        res.append(curr)
        res.append(str(counter))
        counter = 1
        curr = i
res.append(curr)
res.append(str(counter))
print("".join(res))

 b = ['Timothy', 'Sean', 'Anthony']
order = 0
for human in b:
    print(order, '. ', human, sep = '')
    order = order + 1

[code python][/code]