#include<iostream>
#include<cstring>
using namespace std;
string s1,s2;
int f[110],d[110][110],l;
int main()
{
    freopen("painter.in","r",stdin);
    freopen("painter.out","w",stdout);
    while(cin>>s1>>s2)
    {
        memset(d,0x3f,sizeof(d));
        memset(f,0x3f,sizeof(f));
        l=s1.length();
        for(int i=0;i<l;i++)
        {
            d[i][i]=1;
        }
        for(int len=2;len<=l;len++)
        {
            for(int i=0;i+len-1<l;i++)
            {
                int j=i+len-1;
                d[i][j]=d[i][j-1]+1;
                for(int k=i;k<j;k++)
                {
                    d[i][j]=min(d[i][j],d[i][k]+d[k+1][j]);
                }
                if(s2[i]==s2[j])
                {
                    d[i][j]--;
                }
            }
        }
        for(int i=0;i<l;i++)
        {
            f[i]=d[0][i];
            if(s1[i]==s2[i])
            {
                f[i]=min(f[i],f[i-1]);
                if(i==0)
                {
                    f[i]=0;
                }
            }
            else
            {
                for(int j=0;j<i;j++)
                {
                    f[i]=min(f[i],f[j]+d[j+1][i]);
                }
            }
        }
        cout<<f[l-1]<<endl;
    }
    return 0;
}