//这里填你的代码
#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
const int N = 1010;
char a[N], b[N];
int f[N][N];
int main()
{
int n, m;
scanf("%d%s" , &n,a+1);
scanf("%d%s" , &m,b+1);
for(int i = 0; i <= n; i ++ ) f[i][0] = i;
for(int i = 0; i <= m; i ++ ) f[0][i] = i;
for(int i = 1; i <= n; i ++ )
for(int j = 1; j <= m; j ++ )
{
f[i][j] = min(f[i-1][j]+1,f[i][j-1]+1);
if(a[i] == b[j]) f[i][j] = min(f[i][j] , f[i-1][j-1]);
else f[i][j] = min(f[i][j] , f[i-1][j-1]+1);
}
cout << f[n][m] << endl;
return 0;
}
//注意代码要放在两组三个点之间,才可以正确显示代码高亮哦~