#include<bits/stdc++.h>
using namespace std;
int lcs(string s1,string s2)
{
    int n = s1.length();
    int m = s2.length();
    
    vector<vector<int>> mat(n+1, vector<int>(m+1,0));
    for(int i=0;i<=n;i++)
    {
        for(int j=0;j<=m;j++)
        {
            if(s1[i - 1]==s2[j - 1])
            {
                mat[i][j] = mat[i - 1]mat[j - 1] + 1;
                
            }
            else
            {
                mat[i][j] = max(mat[i - 1][j],mat[i][j - 1]);
            }
        }
    }
    return mat[n][m];
}
int main()
{
    string s1,s2;
    cin>>s1>>s2;
    lcs(s1,s2);
}