#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <cstring>
#include <map>
using namespace std;
typedef long long ll;

const int maxn = 105;
const ll INF = 1e16;
string a, b;

int dp[1005][1005];
int rec(int i, int j) {
    if(i < 0 or j < 0) {
        return 0;
    }

    if(dp[i][j] != -1) {
        return dp[i][j];
    }
    int res = 0;

    if(a[i] == b[j]) {
        res = max(res, rec(i - 1, j - 1) + 1);
    }

    res = max(res, rec(i - 1, j));
    res = max(res, rec(i, j - 1));

    dp[i][j] = res;
    return res;
}
int main()
{
    memset(dp, -1, sizeof dp);
    cin >> a >> b;

    cout << rec((int) a.size() - 1, (int) b.size() - 1) << endl;

return 0;
}