Problem: You are given strings s and t. Find one longest string that is a subsequence of both s and t.

Constraints

* s and t are strings consisting of lowercase English letters.
* 1 \leq |s|, |t| \leq 3000

Input

Input is given from Standard Input in the following format:


s
t


Output

Print one longest string that is a subsequence of both s and t. If there are multiple such strings, any of them will be accepted.

Examples

Input

axyb
abyxb


Output

axb


Input

aa
xayaz


Output

aa


Input

a
z


Output




Input

abracadabra
avadakedavra


Output

aaadara

Solution (in PYTHON3):

Solution:
S = input()
T = input()

dp = [[0] * (len(T)+1) for i in range(len(S)+1)]
for i, s in enumerate(S, 1):
  for j, t in enumerate(T, 1):
    if s == t:
      dp[i][j] = dp[i-1][j-1] + 1
    else:
      dp[i][j] = max(dp[i-1][j], dp[i][j-1])

ans = []
while i > 0 and j > 0:
  if dp[i][j] == dp[i][j-1]:
    j -= 1
  elif dp[i][j] == dp[i-1][j]:
    i -= 1
  else:
    ans.append(S[i-1])
    i -= 1
    j -= 1

print(''.join(ans[::-1]))