This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
 
using namespace std;
 
const int mxn = 2e5+5;
 
typedef long long ll;
typedef unsigned int ui;
typedef unsigned long long ull;
typedef pair<int,int>pii;
typedef pair<int,pii>piii;
 
#define  sf scanf
#define  pf printf
 
#define  input freopen("in.txt","r",stdin)
#define  output freopen("out.txt","w",stdout)
 
#define  inf 1e18
#define  ff first
#define  ss second
#define  MP make_pair
#define  pb push_back
#define  all(v) v.begin(), v.end()
#define  printcase(cases) printf("Case %d:", cases);
#define  Unique(a) a.erase(unique(a.begin(),a.end()),a.end())
#define  FAST  ios_base::sync_with_stdio(0);cout.tie(0)
#define  endl printf("\n")
#define  __lcm(a, b) ((a*b)/__gcd(a, b))
 
map<string,int>mark;
int vis[mxn];
int in[mxn];
int dir[mxn];
int main()
{
   // input;
   // output;
 
    int n, m, k;
    cin >> n >> m >> k;
    vector<bitset<4105> >v;
    for(int i = 0; i < n; i++)
    {
        string s;
        cin >> s;
        bitset<4105>tmp;
       // cout << tmp << '\n';
        for(int r = 0; r < m; r++)
        {
            if(s[r]=='A') tmp[r] = '1';
        }
        v.push_back(tmp);
    }   
    int ans = -1;
    for(int i = 0; i < n; i++)
    {
        int cnt = 0;
        for(int r = 0; r < n; r++)
        {
            if(i==r) continue;
            bitset<4105>tmp = v[i]^v[r];
            int x = tmp.count();
            if(x==k) cnt++;
            else break;
        }
        if(cnt==n-1)
        {
            ans = i+1;
            break;
        }
    }
    cout << ans << '\n';
    return 0;
}
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