#include <bits/stdc++.h>
using namespace std;
#define int long long

#define dbg(x...) \
do { \
std::cout << #x << " -> "; \
err(x); \
} while (0)

void err() {
	std::cout << std::endl;
}

template<class T, class... Ts>
void err(T arg, Ts &... args) {
	std::cout << fixed << setprecision(10) << arg << ' ';
	err(args...);
}

void GENSHEN_START() {
	int n,m,k;cin >> n >> m >> k;
	vector <string> a;
	map<string,int>mp;
	for (int i = 1;i <= n;i++) {
		string s;
		cin >> s;
		string res = "";
		a.push_back(s);
		for (int j = 0;j < m * k;j += k) {
			for (int z = j;z < j + k;z++) {
				res += s[z];
			}
			mp[res]++;
			res.clear();
		}
	}
	string ans;
	for (auto i : mp) {
		if (i.second == 1) {
			ans = i.first;
		}
	}
	for (int i = 0;i < n;i++) {
		string res = "";
		int cnt = 0;
		for (int j = 0;j < m * k;j += k) {
			cnt++;
			for (int z = j;z < j + k;z++) {
				res += a[i][z];
			}
			if (res == ans) {
				cout << i + 1 << ' ' << cnt << '\n';
			}
			res.clear();
		}
	}
}

signed main()
{
	ios::sync_with_stdio(false);cin.tie(nullptr);
	int T = 1;
	//cin >> T;
	while (T--) GENSHEN_START();
	return 0;
}