IDE能通过，在线调试就是通过不了。。

line = input()
count = 0
temp = ""
arr = []
for x in line:
    if x != temp:
        arr.append(count)
        count = 0
    temp = x
    count = count+1
arr.append(count)
del arr[0]
print(format(sum(arr) / len(arr), '.2f'))