c = input()
def iskadomatsu(c):
  if c.index(max(c)) == 1 or c.index(min(c)) == 1:
    return True
  else:
    return False
if iskadomatsu(list(map(int, c.replace("?", "1").split()))) and list(map(int, c.replace("?", "4").split())):
  print(14)
elif iskadomatsu(list(map(int, c.replace("?", "1").split()))):
  print(1)
elif iskadomatsu(list(map(int, c.replace("?", "4").split()))):
  print(4)