#include <iostream>
#include <vector>
using namespace std;
int main()
{
    string a, b;
    cin >> a >> b;

    vector<vector<int> > dp(a.size() + 1, vector<int>(b.size() + 1, -2e9));
    dp[0][0] = 0;

    for(int i = 0; i < a.size(); i++) {
        for(int j = 0; j < b.size(); j++) {
            if(a[i] == b[j]) {
                dp[i + 1][j + 1] = max(dp[i + 1][j + 1], dp[i][j] + 1);
            }
            dp[i + 1][j] = max(dp[i + 1][j], dp[i][j]);
            dp[i][j + 1] = max(dp[i][j + 1], dp[i][j]);
        }
    }
    int lcs = 0;
    for(int i = 0; i <= a.size(); i++) {
        for(int j = 0; j <= b.size(); j++) {
            lcs = max(lcs, dp[i][j]);
        }
    }
    cout << lcs << endl;
    return 0;
}