import sys
readline=sys.stdin.readline

C=readline().split()
i=C.index("?")
for j in range(3):
    if i!=j:
        C[j]=int(C[j])
ans_lst=[]
for c in (1,4):
    C[i]=c
    if len(set(C))==3 and max(C)==C[1] or min(C)==C[1]:
        ans_lst.append(c)
print(*ans_lst,sep="")