s1 = input()
s2 = input()
res = 0
dp = [[0]*(len(s2)+1) for _ in range(len(s1)+1)]
for i in range(1,len(s1)+1):
    for j in range(1,len(s2)+1):
        if s1[i-1] == s2[j-1]:
            dp[i][j] = dp[i-1][j-1] + 1
            res = max(res,dp[i][j])
print(res)