#include<bits/stdc++.h>
using namespace std;
string a, b;
int main()
{
while(getline(cin, a) && getline(cin, b))
{
sort(a.begin(), a.end());
sort(b.begin(), b.end());
for(int i = 0, j = 0;;)
{
if(i >= a.size() || j >= b.size()) break;
if(a[i] == b[j])
{
printf("%c", a[i]);
i++, j++;
}
else
{
if(a[i] > b[j]) j++;
else i++;
}
}
printf("\n");
}
}
using namespace std;
string a, b;
int main()
{
while(getline(cin, a) && getline(cin, b))
{
sort(a.begin(), a.end());
sort(b.begin(), b.end());
for(int i = 0, j = 0;;)
{
if(i >= a.size() || j >= b.size()) break;
if(a[i] == b[j])
{
printf("%c", a[i]);
i++, j++;
}
else
{
if(a[i] > b[j]) j++;
else i++;
}
}
printf("\n");
}
}
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