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#include<iostream>
#include<cstdio>
using namespace std;
int ct = 1, v1[1027], v2[1027], m, n, d[1027][1027], vaux[1027];
int main()
{
FILE* in = fopen("cmlsc.in", "r");
FILE* out = fopen("cmlsc.out", "w");
fscanf(in, "%d%d", &m, &n);
for(int i = 0; i <= m; ++i)
{
d[i][0] = 0;
if(i == 0) continue;
fscanf(in, "%d", &v1[i]);
}
for(int i = 0; i <= n; ++i)
{
d[0][i] = 0;
if(i == 0) continue;
fscanf(in, "%d", &v2[i]);
}
for(int i = 1; i <= m; ++i)
{
for(int j = 1; j <= n; ++j)
{
if(v1[i] == v2[j]) d[i][j] = d[i - 1][j - 1] + 1;
else d[i][j] = max(d[i - 1][j], d[i][j - 1]);
}
}
int i = m;
int j = n;
fprintf(out, "%d\n", d[m][n]);
while(true)
{
if(v1[i] == v2[j])
{
vaux[ct] = v1[i];
++ct;
}
if(d[i][j] == d[i - 1][j - 1] + 1 && v1[i] == v2[j])
{
--i;
--j;
}
else
{
if(d[i - 1][j] < d[i][j - 1]) -- j;
else --i;
}
if(i == 0 || j == 0) break;
}
--ct;
for(int i = ct; i >= 1; --i)
{
fprintf(out, "%d ", vaux[i]);
}
}