Buggy python submission (verdict: Time Limit Exceeded):
a = 'a'*2000
b = 'b'*2000
c = 'c'*2000

len_a = len(a)
len_b = len(b)
len_c = len(c)

def match(a, b):
    return a=='?' or b=='?' or a==b

dp_len=50000
ab = [True] * dp_len
ac = [True] * dp_len
bc = [True] * dp_len

def check(a, b, ab):
    for i in range(len(a)):
        for j in range(len(b)):
            if not match(a[i], b[j]):
                ab[i-j+dp_len//2] = False

check(a, b, ab)
check(a, c, ac)
check(b, c, bc)

len_max = len(a)+len(b)+len(c)

ans = len_max
for i in range(-2*len_max, 2*len_max+1):
    for j in range(-2*len_max, 2*len_max+1):
        if ab[i+dp_len//2] and ac[j+dp_len//2] and bc[j-i+dp_len//2]:
            ans = min(ans, max(len_a, len_b+i, len_c+j) - min(0, i, j))
print(ans)



Fixed submission:
"""
a = 'a'*2000
b = 'b'*2000
c = 'c'*2000
"""
a = input()
b = input()
c = input()


len_a = len(a)
len_b = len(b)
len_c = len(c)

def match(a, b):
    return a=='?' or b=='?' or a==b

dp_len=50000
ab = [True] * dp_len
ac = [True] * dp_len
bc = [True] * dp_len

def check(a, b, ab):
    for i in range(len(a)):
        for j in range(len(b)):
            if not match(a[i], b[j]):
                ab[i-j+dp_len//2] = False

check(a, b, ab)
check(a, c, ac)
check(b, c, bc)

len_max = 2000

ans = len_a+len_b+len_c
for i in range(-2*len_max, 2*len_max+1):
    for j in range(-2*len_max, 2*len_max+1):
        if ab[i+dp_len//2] and ac[j+dp_len//2] and bc[j-i+dp_len//2]:
            ans = min(ans, max(len_a, len_b+i, len_c+j) - min(0, i, j))
print(ans)

Buggy python submission (verdict: Runtime Error):
a = input()
b = input()
c = input()

len_a = len(a)
len_b = len(b)
len_c = len(c)

def match(a, b):
    return a=='?' or b=='?' or a==b


ab = [True] * 20000
ac = [True] * 20000
bc = [True] * 20000

def check(a, b, ab):
    for i in range(len(a)):
        for j in range(len(b)):
            if not match(a[i], b[j]):
                ab[i-j+10000] = False

check(a, b, ab)
check(a, c, ac)
check(b, c, bc)

len_max = len(a)+len(b)+len(c)

ans = len_max
for i in range(-2*len_max, 2*len_max+1):
    for j in range(-2*len_max, 2*len_max+1):
        if ab[i+10000] and ac[j+10000] and bc[j-i+10000]:
            ans = min(ans, max(len_a, len_b+i, len_c+j) - min(0, i, j))
print(ans)



Fixed submission:
"""
a = 'a'*2000
b = 'b'*2000
c = 'c'*2000
"""
a = input()
b = input()
c = input()


len_a = len(a)
len_b = len(b)
len_c = len(c)

def match(a, b):
    return a=='?' or b=='?' or a==b

dp_len=50000
ab = [True] * dp_len
ac = [True] * dp_len
bc = [True] * dp_len

def check(a, b, ab):
    for i in range(len(a)):
        for j in range(len(b)):
            if not match(a[i], b[j]):
                ab[i-j+dp_len//2] = False

check(a, b, ab)
check(a, c, ac)
check(b, c, bc)

len_max = 2000

ans = len_a+len_b+len_c
for i in range(-2*len_max, 2*len_max+1):
    for j in range(-2*len_max, 2*len_max+1):
        if ab[i+dp_len//2] and ac[j+dp_len//2] and bc[j-i+dp_len//2]:
            ans = min(ans, max(len_a, len_b+i, len_c+j) - min(0, i, j))
print(ans)

Buggy python submission (verdict: Runtime Error):
a = input()
b = input()
c = input()

len_a = len(a)
len_b = len(b)
len_c = len(c)

def match(a, b):
    return a=='?' or b=='?' or a==b


ab = [True] * 9000
ac = [True] * 9000
bc = [True] * 9000

def check(a, b, ab):
    for i in range(len(a)):
        for j in range(len(b)):
            if not match(a[i], b[j]):
                ab[i-j+4500] = False

check(a, b, ab)
check(a, c, ac)
check(b, c, bc)

len_max = len(a)+len(b)+len(c)

ans = len_max
for i in range(-2*len_max, 2*len_max+1):
    for j in range(-2*len_max, 2*len_max+1):
        if ab[i+4500] and ac[j+4500] and bc[j-i+4500]:
            ans = min(ans, max(len_a, len_b+i, len_c+j) - min(0, i, j))
print(ans)



Fixed submission:
"""
a = 'a'*2000
b = 'b'*2000
c = 'c'*2000
"""
a = input()
b = input()
c = input()


len_a = len(a)
len_b = len(b)
len_c = len(c)

def match(a, b):
    return a=='?' or b=='?' or a==b

dp_len=50000
ab = [True] * dp_len
ac = [True] * dp_len
bc = [True] * dp_len

def check(a, b, ab):
    for i in range(len(a)):
        for j in range(len(b)):
            if not match(a[i], b[j]):
                ab[i-j+dp_len//2] = False

check(a, b, ab)
check(a, c, ac)
check(b, c, bc)

len_max = 2000

ans = len_a+len_b+len_c
for i in range(-2*len_max, 2*len_max+1):
    for j in range(-2*len_max, 2*len_max+1):
        if ab[i+dp_len//2] and ac[j+dp_len//2] and bc[j-i+dp_len//2]:
            ans = min(ans, max(len_a, len_b+i, len_c+j) - min(0, i, j))
print(ans)