import java.util.Scanner;

public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in);

String x=sc.next();
	String y=sc.next();
	int[][] dp=new int[x.length()+1][y.length()+1];
	
	
	
	for (int i = 0; i < x.length(); i++) {
		for (int j = 0; j <y.length(); j++) {
			
			if(x.charAt(i)==y.charAt(j)) {
				dp[i+1][j+1]=dp[i][j]+1;
			}else {
				dp[i+1][j+1]=Math.max(dp[i][j+1],dp[i+1][j]);
			}
		}
	}
	System.out.println(dp[x.length()][y.length()]);
}

}