#include <iostream>
#include <queue>
#include <vector>
using namespace std;

int main()
{ 
  int n, m;
  cin >> n >> m;
  int W;
  cin >> W;

  char mat[n][m];
  for(int i = 0; i < n; i++) {
    for(int j = 0; j < m; j++) {
      cin >> mat[i][j];
    }
  }  

  int di[] = {-1, 1, 0, 0};
  int dj[] = {0, 0, -1, 1};
  vector<vector<int>> cnt(n, vector<int>(m, 0));
  for(int i = 0; i < n; i++) {
    for(int j = 0; j < m; j++) {
      if(mat[i][j] == 'C') {
        queue<int> q;
        q.push(i);
        q.push(j);
        q.push(0);
        vector<vector<bool>> visited(n, vector<bool>(m, false));
        visited[i][j] = true;
        while(!q.empty()) {
          int ci = q.front();
          q.pop();
          int cj = q.front();
          q.pop();
          int cekor = q.front();
          q.pop();  
          cnt[ci][cj]++;

          for(int k = 0; k < 4; k++) {
            int ti = ci + di[k];
            int tj = cj + dj[k];
            if(ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#' and !visited[ti][tj]) {
                if(cekor + 1 <= W) {
                    q.push(ti);
                    q.push(tj);
                    q.push(cekor + 1);
                    visited[ti][tj] = true;
                }
            }
          }


        }
      }
    }
  }
  int res = 0;
  int ri = 0, rj = 0;
  for(int i = 0; i < n; i++) {
    for(int j = 0; j < m; j++) {
      if(res < cnt[i][j] and mat[i][j] == '.') {
        res = cnt[i][j];
        ri = i;
        rj = j;
      }
    }
    
  }
  cout << ri + 1 << " " << rj + 1<< endl;
    return 0;
}
 /*
CX..
C...

K = 2
 
 
 **/