题解 | #公共子串计算#

a = input()
b = input()
r = []
if len(a) <= len(b):
    a, b = a, b
else:
    a, b = b, a
for i in range(len(a)+1):
    for j in range(len(b)+1):
        if a[i:j] in b:
            if j-i > 0:
                r.append(len(a[i:j]))
if len(r) == 0:
    print('0')
else:
    print(max(r))