import sys

sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def MI(): return map(int, sys.stdin.buffer.readline().split())
def MI1(): return map(int1, sys.stdin.buffer.readline().split())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
inf = 10**16
# md = 998244353
md = 10**9+7

def iskado(aa):
    a, b, c = aa
    if a == b or b == c or c == a: return False
    if a > b < c or a < b > c: return True
    return False

aa = SI().split()
aa = [-1 if a == "?" else int(a) for a in aa]

ans = ""
i = aa.index(-1)
for x in [1, 4]:
    aa[i] = x
    if iskado(aa): ans += str(x)
print(ans)