#include <bits/stdc++.h>
// #ifndef ONLINE_JUDGE
// #include <debug.h>
// #else
// #define debug(...)
// #endif
#define GOOD_LUCK ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define int long long
#define endl "\n"
#define ff first
#define ss second
#define pb push_back
#define all(v) v.begin(), v.end()
using namespace std;
constexpr int MAX = 2e+5 + 1, INF = 2e+16, MOD = 1e+9 + 7, K = 31;
void _() {
int n, m;
cin >> n >> m;
vector <string> v(n);
for (auto &i : v) cin >> i;
bool is1 = 0, is2 = 0;
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
if (v[i][j] == 'F') is1 = 1;
if (v[i][j] == 'R') is2 = 1;
}
}
if (is1 && is2) cout << 2;
else if (!is1 && !is2) cout << 0;
else cout << 1;
}
signed main() {
GOOD_LUCK
int tests=1;
// cin >> tests;
for (int i=1; i <= tests; i++) {
_();
cout << endl;
}
return 0;
}
