1 #include<iostream>
 2 #include<cstdio>
 3 using namespace std;
 4 const int N=1005;
 5 
 6 string x,y;
 7 int a[N][N];
 8 int main(){
 9     cin>>x>>y;
10     int lenx=x.length(),leny=y.length();
11     for(int i=1;i<=leny;i++){
12         for(int j=1;j<=lenx;j++){
13             a[i][j]=max(a[i-1][j],a[i][j-1]);
14             if(y[i-1]==x[j-1])
15                 a[i][j]=max(a[i][j],a[i-1][j-1]+1);
16         }
17     }
18     cout<<a[leny][lenx];
19     return 0;
20 }