import math

def strfhex(s):
    m,e = s.split("p")
    return int(m,16)*2.0**int(e,16)

def fhex(f):
    m,e = math.frexp(f)
    BITS = 54
    mi = int(m*2**BITS)
    e = e - BITS
    while mi & 1 == 0:
        e += 1
        mi = mi >> 1
    return hex(mi)+"p"+hex(e)