#include<iostream>
#include<cstring>
using namespace std;
string a,b;
const int N = 1010;
int dp[N][N];
int main()
{
    while(cin>>a>>b)
    {
        memset(dp,0,sizeof dp);
        for(int i=1;i<=a.size();i++)
        {
            for(int j=1;j<=b.size();j++)
            {
                if(a[i-1]==b[j-1]) dp[i][j] = dp[i-1][j-1]+1;
                else dp[i][j] = max(dp[i-1][j],dp[i][j-1]);
            }
        }
        cout<<dp[a.size()][b.size()]<<endl;
    }
}