import sys,collections;sys.setrecursionlimit(10**7)
from operator import itemgetter
def Is(): return [int(x) for x in sys.stdin.readline().split()]
def Ss(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def S(): return input()

s = Ss()
ans = []
if s.index("?") == 1:
    print(14)
    exit()
if s.index("?") == 2:
    ans = [1,4]
else:
    ans = [4,1]
s.remove("?")
if s[0] < s[1]:
    print(ans[0])
else:
    print(ans[1])