#include <bits/stdc++.h>
using namespace std;

#include <atcoder/dsu>

#include "testlib.h"

int main() {
	registerValidation();
	int h = inf.readInt(1, 100000);
	inf.readSpace();
	int w = inf.readInt(1, 100000);
	inf.readEoln();
	ensure((long long)h * w <= 100000);
	for(int i = 0; i < h; i++) {
		string s = inf.readString();
		ensure(s.size() == w);
		for(auto &c: s)ensure(c == '.' or c == 'r' or c == 'h');
	}
	inf.readEof();
	return 0;
}