#include <bits/stdc++.h>
#define rd freopen("input.txt", "r", stdin)
#define wr freopen("output.txt", "w", stdout)
#define ff ios_base::sync_with_stdio(0)
#define gg cin.tie(0)
using namespace std;
int main() {
gg; ff;
int dp[310][310], cs = 1, i, j, mx, k, l;
string s1, s2, s;
while (cin >> s1 >> s2) {
if (cs != 1)cout << "\n";
cs++;
mx = 0;
memset(dp, 0, sizeof(dp));
for (i = 1; i <= s1.size(); i++) {
for (j = 1; j <= s2.size(); j++) {
if (s1[i - 1] == s2[j - 1]) {
dp[i][j] = dp[i - 1][j - 1] + 1;
if (dp[i][j] > mx)mx = dp[i][j];
}
else dp[i][j] = 0;
}
}
if (mx < 1)cout << "No common sequence.\n";
else {
set<string> ans;
for (i = 1; i <= s1.size(); i++) {
for (j = 1; j <= s2.size(); j++) {
if (dp[i][j] == mx) {
ans.insert(s1.substr(i-mx, mx));
}
}
}
set<string>::iterator it = ans.begin();
for (; it != ans.end(); it++)cout << *it << "\n";
}
}
}
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