s = "7b425448.5f796877.5f643164.34735f31.745f3376.665f3368.5f67346c.745f6e30.355f3368.6b633474.7d213f"
flag = ""
for elem in s.split("."):
    t = ""
    for i in range(4):
        t = elem[i*2:i*2+2] + t
    flag += t
print(flag)