#include <bits/stdc++.h>
using namespace std;
template <typename T>
inline T read(){
    T x=0;char ch=getchar();bool fl=false;
    while(!isdigit(ch)){if(ch=='-')fl=true;ch=getchar();}
    while(isdigit(ch)){
        x=(x<<3)+(x<<1)+(ch^48);ch=getchar();
    }
    return fl?-x:x;
}
#define FASTIO ios::sync_with_stdio(false);cin.tie(0);
#define LL long long
#define LD long double
#define read() read<int>()
const int maxn = 205;
string s[maxn];
int n,m,k;
unordered_map<string,int> mp;
int main(){
    FASTIO;
    cin>>n>>m>>k;
    for(int i=1;i<=n;i++)cin>>s[i];
    for(int i=1;i<=n;i++){
        for(int j=0;j<s[i].size();j+=k){
            string t;
            for(int jj=j;jj<j+k;jj++)t.push_back(s[i][jj]);
            mp[t]++;
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=0;j<s[i].size();j+=k){
            string t;
            for(int jj=j;jj<j+k;jj++)t.push_back(s[i][jj]);
            if(mp[t]==1){
                cout<<i<<" "<<j/k+1<<'\n';return 0;
            }
        }
    }
    return 0;
}