#include<cstdio>
#include<cstring>
using namespace std;
//LCSub问题，水题,滚动数组优化空间
int main()
{
    char str[1005],str1[1005];
    int dp[2][1005];
    int n,m;
    while(~scanf("%s %s",str,str1))
    {
        memset(dp,0,sizeof(dp));
        n = strlen(str);
        m = strlen(str1);
        for(int i = 1; i<=n; ++i)
            for(int j = 1; j<=m; ++j)
                dp[i%2][j] = (str[i-1]==str1[j-1])?(dp[(i-1)%2][j-1] + 1):(dp[(i-1)%2][j]>dp[i%2][j-1]?dp[(i-1)%2][j]:dp[i%2][j-1]);
        printf("%d\n",dp[n%2][m]);
    }
    return 0;
}