927 B | 927 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
s = input()
happy = 0
sad = 0
for i in s:
if i in "APHYaphy":
happy += 1
if i in "ASDasd":
sad += 1
if happy == sad == 0:
p("50.00")
else:
k = happy * 100 / (happy + sad)
a = (happy * 100000 // (happy + sad)) // 1000
b = happy * 100000 // (happy + sad) % 1000
if b % 10 >= 5:
b = (b // 10) + 1
else:
b = (b // 10)
while b > 99:
a += 1
b = b % 100
p(f"{a}.{b:02d}")
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()