#include <stdio.h>

char x[1024][1024], frequence[30];
int dp[1024][1024];
bool good[1024][1024];

int main()
{
	int i, j, letter, N, M;
	char ch;
	
	freopen("matrix.in", "r", stdin);
	freopen("matrix.out", "w", stdout);
	
	scanf("%d%d\n", &N, &M);
	for (i = 1; i <= N; i ++)
		for (j = 1; j <= N; j ++)
			scanf(" %c ", &x[i][j]);
	
	for (i = 1; i <= M; i ++)
		for (j = 1; j <= M; j ++)
		{
			scanf(" %c ", &ch);
			frequence[ch - 'a'] ++;
		}
	for (i = M; i <= N; i ++)
		for (j = M; j <= N; j ++)
			good[i][j] = true;
		
	for (letter = 0; letter <= 25; letter ++)
		for (i = 1; i <= N; i ++)
			for (j = 1; j <= N; j ++)
			{
				dp[i][j] = dp[i - 1][j] + dp[i][j - 1] - dp[i - 1][j - 1];
				if (x[i][j] == letter + 'a')
					dp[i][j] ++;
				if (good[i][j])
				{
					int now = dp[i][j] - dp[i - M][j] - dp[i][j - M] + dp[i - M][j - M];
					if (now != frequence[letter])
						good[i][j] = false;
				}
			}
	
	int sol = 0;
	for (i = 1; i <= N; i ++)
		for (j = 1; j <= N; j ++)
			sol += good[i][j];
	
	printf("%d", sol);
	return 0;
}