import sys

def a(str):
    print(str, file=sys.stderr)
    
    o_count = str.count("o")
    print(o_count, file=sys.stderr)
    
    x_count = str.count("x")
    print(x_count, file=sys.stderr)
    
    ret = o_count / (o_count + x_count ) * 100
    print(ret)

first = input()

for i in range(len(first)):
    a(first)
    first = first[1:]