#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops,fast-math,unsafe-math-optimizations")
#define int long long
#define f first
#define s second
#define pii pair <int, int>
#define iShowSpeed cin.tie(NULL)->sync_with_stdio(false)
#define emb emplace_back
using namespace std;
const int inf = 1e14;
const int mod = 998244353;
int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};
bool can(int k, int n, int sx, int sy, int ex, int ey, vector <vector <int>> &bee, vector <vector <char>> &a, int mid) {
queue <pii> q; q.emplace(sx, sy);
vector <vector <int>> bear(n, vector <int> (n, inf));
bear[sx][sy] = 0;
while (!q.empty()) {
auto [x, y] = q.front(); q.pop();
for (int i = 0; i < 4; i++) {
int nx = x + dx[i], ny = y + dy[i];
int dist = (bear[x][y]+1) / k;
if (nx < 0 || nx >= n || ny < 0 || ny >= n || bear[nx][ny] != inf || dist + mid >= bee[nx][ny] || a[nx][ny] == 'T') continue;
if (nx == ex && ny == ey) return true;
bear[nx][ny] = bear[x][y]+1;
q.emplace(nx, ny);
}
}
return false;
}
int32_t main(){
iShowSpeed;
int n, k; cin >> n >> k;
vector <vector <char>> a(n, vector <char> (n));
for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) cin >> a[i][j];
cout << -1;
}
