#include <iostream>

int n, m, c;
char h[1000][1000];
int main() {
	std::cin >> n >> m;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			std::cin >> h[i][j];
		}
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			if (h[i][j] == 'h' && h[i][j + 1] == 'e' && h[i][j + 2] == 'h' && h[i][j + 3] == 'e' ||
				h[i][j] == 'h' && h[i + 1][j] == 'e' && h[i + 2][j] == 'h' && h[i + 3][j] == 'e' ||
				h[i][j] == 'h' && h[i][j - 1] == 'e' && h[i][j - 2] == 'h' && h[i][j - 3] == 'e' ||
				h[i][j] == 'h' && h[i - 1][j] == 'e' && h[i - 2][j] == 'h' && h[i - 3][j] == 'e') {
				c++;
			}
		}
	}
	std::cout << c << std::endl;
	return 0;
}

第1个AC，剩下全WA