题解 | #查找两个字符串a,b中的最长公共子串#

while True:
    try:
        s1 = input()
        s2 = input()
        if len(s1) > len(s2):
            s1,s2 = s2,s1
        res = []
        opt = ''
        for i in range(len(s1)):
            for j in range(i+1,len(s1)+1):
                if s1[i:j] in s2:
                    res.append(s1[i:j])
        for i in res:
            if len(i) > len(opt):
                opt = i
        print(opt)
    except:
        break