#include
#include
#define N 20
void LCSLength(int m,int n,char x[N+1],char y[N+1],char b[N+1][N+1]);
void LCS(int i,int j,char x[N+1],char b[N+1][N+1]);
void main()
{
int lx,ly;
char X[N+1],Y[N+1];
int B[N+1][N+1];
scanf("%s",X+1);
scanf("%s",Y+1);
lx=strlen(X+1);
ly=strlen(Y+1);
LCSLength(lx,ly,X,Y,B);
LCS(lx,ly,X,B);
}
/* Functions */
void LCSLength(int m,int n,char x[],char y[],char b[N+1][N+1])
{
int i,j;
int c[N+1][N+1];
for (i=1;i<=m;i++)
c[i][0]=0;
for (i=1;i<=n;i++)
c[0][i]=0;
for (i=1;i<=m;i++)
for (j=1;j<=n;j++)
{
if (x[i]==y[j])
{
c[i][j]=c[i-1][j-1]+1;
b[i][j]='A';
}
else if (c[i-1][j]>=c[i][j-1])
{
c[i][j]=c[i-1][j];
b[i][j]='U';
}
else
{
c[i][j]=c[i][j-1];
b[i][j]='L';
}
}
}
void LCS(int i,int j,char x[],char b[N+1][N+1])
{
if (i==0 || j==0)
return;
if (b[i][j]=='A')
{
LCS(i-1,j-1,x,b);
printf("%c",x[i]);
}
else if (b[i][j]=='U')
LCS(i-1,j,x,b);
else LCS(i,j-1,x,b);
}
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