python```

num_list = []
num = str(input())
for i in range(len(num)):
    num_list.append(num[i])
num_list.remove(".")
num_list.reverse()
num_list = list(map(int, num_list))
rev_num = num_list[0] + num_list[1]*0.1 + num_list[2]*0.01 + num_list[3]*0.001
print(float(rev_num))