#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;
//Dijkstra->set
//set.find_by_order(x) x-position value
//set.order_of_key(x) number of strictly less elements don't need *set.??
#define N 100005
#define wr cout << "Continue debugging\n";
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <int, int>
#define pb push_back
#define ff first
#define ss second
// int X[] = {-1, 1, 0, 0};
// int Y[] = {0, 0, -1, 1};
// void calc(char ch, int x, int y, vector<vector<bool>>&vis, vector<vector<char>> c, int n, int m){
// queue<pii> q; q.push({x, y});
// while(!q.empty()){
// int x = q.front().ff, y = q.front().ss;
// q.pop();
// if (vis[x][y]) continue;
// vis[x][y] = 1;
// for (int i = 0; i < 4; i++){
// int a = x+X[i], b = y+Y[i];
// if (a > 0 and b > 0 and a <= n and b <= m and c[a][b] == ch and !vis[a][b]){
// q.push({a, b});
// }
// }
// }
// }
int main ()
{
ios::sync_with_stdio(false);
cin.tie(0);
int n, m;
cin >> n >> m;
vector<vector<char>> c(n+1, vector<char>(m+1));
int a = 0, b = 0;
for (int i = 1; i <= n; i++){
for (int j = 1; j <= m; j++) cin >> c[i][j];
a += count(all(c[i]), 'F');
b += count(all(c[i]), 'R');
}
if (a and b) cout << "2\n";
else if (!a and !b) cout << "0\n";
else cout << "1\n";
// int ans = 0;
// vector<vector<bool>> vis(n+1, vector<bool>(m+1, 0));
// for (int i = 1; i <= n; i++){
// for (int j = 1; j <= m; j++){
// if (vis[i][j] or c[i][j] == '.') continue;
// ans++;
// calc(c[i][j], i, j, vis, c, n, m);
// }
// }
// cout << ans << '\n';
}
