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;
    string s[n];
    for(int i = 0; i < n; i++) cin >> s[i];
    int ans = -1;
    for(int i = 0; i < n; i++)
    {
        int ok = true;
        for(int r = 0; r < n; r++)
        {
            if(i==r) continue;
            int d = 0;
            for(int j = 0; j < m; j++)
                if(s[i][j]!=s[r][j]) d++;
            if(d!=k)
            {
                ok = false;
                break;
            }
        }
        if(ok) 
        {
            ans = i+1;
            break;
        }
    }
    cout << ans << '\n';
    return 0;
}
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