/*

@theme:hdu1159

@writer:pprp

@begin:17:01

@end:17:06

@declare:LCS的裸题,温习一下

@error:从1开始读入的话，用strlen也要从1开始测才可以

@date:2017/9/2

*/

#include <bits/stdc++.h>

using namespace std;

char s1[],s2[];

int dp[][];

int main()

{

    //freopen("in.txt","r",stdin);

    while(~scanf("%s%s",s1+,s2+))

    {

        memset(dp,,sizeof(dp));

        int n = strlen(s1+);

        int m = strlen(s2+);

        for(int i = ; i <= n ;i++)

        {

            for(int j = ; j <= m ; j++)

            {

                if(s1[i] == s2[j])

                    dp[i][j] = dp[i-][j-] + ;

                else

                    dp[i][j] = max(dp[i-][j],dp[i][j-]);

            }

        }

        cout << dp[n][m] << endl;

    }

    return ;

}