#include<iostream>

#include<cstdio>

#include<cmath>

#include<queue>

#include<vector>

#include<string.h>

#include<cstring>

#include<algorithm>

#include<set>

#include<map>

#include<fstream>

#include<cstdlib>

#include<ctime>

#include<list>

#include<climits>

#include<bitset>

using namespace std;

#define fio ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

#define fopen freopen("input.in", "r", stdin);freopen("output.in", "w", stdout);

#define left asfdasdasdfasdfsdfasfsdfasfdas1

#define tan asfdasdasdfasdfasfdfasfsdfasfdas

typedef long long ll;

typedef unsigned int un;

const int desll[][]={{,},{,-},{,},{-,}};

const ll mod=1e9+;

const int maxn=4e2+;

const int maxm=1e6+;

const double eps=1e-;

int m,n,p;

int ar[maxn];

char c[maxn];

set<pair<int,string> > se;

set<string> seMid;

char cha(char c)

{

    return c==''?'':'';

}

int main()

{

    fopen

    int t,fir=;scanf("%d",&t);

    while(t--){

        scanf("%d%d%d",&n,&m,&p);

        memset(ar,,sizeof(ar));

        seMid.clear();

        se.clear();

        for(int i=;i<n;i++){

            scanf("%s",c);

            for(int j=;j<p;j++){

                if(c[j]=='')ar[j]++;

            }

        }

        for(int i=;i<m;i++){

            scanf("%s",c);

            seMid.insert(string(c));

        }

        string str(p,'');

        int mid=;

        for(int i=;i<p;i++){

            if(ar[i]>n/){

                str[i]='';

                ar[i]=n-ar[i];

            }

            mid+=ar[i];

        }

        se.insert(make_pair(mid,string(str)));

        int ans=;

        while((int)se.size()<=m){

            int mn=p*n;

            string ss;

            for(set<pair<int,string>>::iterator au = se.begin();au!=se.end();au++){

                mid = au->first;

                string sMid = au->second;

                if(mid>mn)break;

                for(int i=;i<p;i++){

                    if(sMid[i]==str[i] && mn>mid+n-*ar[i]){

                        sMid[i] = cha(sMid[i]);

                        if(se.count(make_pair(mid+n-*ar[i],sMid))==){

                            mn=mid+n-*ar[i];

                            ss=sMid;

                        }

                        sMid[i] = cha(sMid[i]);

                    }

                }

            }

            se.insert(make_pair(mn,ss));

            if(seMid.count(ss)==)break;

        }

        set<pair<int,string>>::iterator au=se.begin();

        for(;au!=se.end();au++){

            string sMid = au->second;

            if(seMid.count(sMid)==){

                ans=au->first;

                break;

            }

        }

        printf("Case #%d: %d\n",++fir,ans);

    }

    return ;

}