#include<bits/stdc++.h>
using namespace std;
int lcs(string s1,string s2,int m,int n){
int l[m+1][n+1];
for(int i=0;i<=m;i++){
for(int j=0;j<=n;j++){
if(i==0 || j==0){
l[i][j]=0;
}
else if(s1[i-1]==s2[j-1]){
l[i][j]=1+l[i-1][j-1];
}
else{
l[i][j]=max(l[i-1][j],l[i][j-1]);
}
}
}
return l[m][n];
}
int main()
{
string s1,s2;
cin>>s1>>s2;
int m=s1.size();
int n=s2.size();
cout<<"Length of LCS is "<<lcs(s1,s2,m,n)<<endl;
}
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