abcd = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
kek = "0123456789"
s = input()
hello = True
if s[0] not in abcd:
    hello = False
for i in range(1,4):
    if s[i] not in kek:
        hello = False
if s[4] not in abcd:
    hello = False
if s[5] not in abcd:
    hello = False
if hello:
    print("Yes")
else:
    print("No")