The developers of Looksery have to write an efficient algorithm that detects faces on a picture. Unfortunately, they are currently busy preparing a contest for you, so you will have to do it for them. 

In this problem an image is a rectangular table that consists of lowercase Latin letters. A face on the image is a 2 × 2 square, such that from the four letters of this square you can make word "face". 

You need to write a program that determines the number of faces on the image. The squares that correspond to the faces can overlap.
The first line contains two space-separated integers, *n* and *m* (1 ≤ *n*, *m* ≤ 50) — the height and the width of the image, respectively.

Next *n* lines define the image. Each line contains *m* lowercase Latin letters.
n, m = map(int, input().split())
answer = 0
face_detector = [input() for i in range(n)]
for i in range(n):
  for j in range(m):
    if face_detector[i][j] == 'f':
      if i > 0:
        if j > 0:
          if face_detector[i-1][j] == 'a':
            if face_detector[i-1][j-1] == 'c':
              if face_detector[i][j-1] == 'e':
                answer += 1
            elif face_detector[i-1][j-1] == 'e':
              if face_detector[i][j-1] == 'c':
                answer += 1
          elif face_detector[i-1][j] == 'c':
            if face_detector[i-1][j-1] == 'a':
              if face_detector[i][j-1] == 'e':
                answer += 1
            elif face_detector[i-1][j-1] == 'e':
              if face_detector[i][j-1] == 'a':
                answer += 1
          elif face_detector[i-1][j] == 'e':
            if face_detector[i-1][j-1] == 'c':
              if face_detector[i][j-1] == 'a':
                answer += 1
            elif face_detector[i-1][j-1] == 'a':
              if face_detector[i][j-1] == 'c':
                answer += 1
        if j < m-1:
          if face_detector[i-1][j] == 'a':
            if face_detector[i-1][j+1] == 'c':
              if face_detector[i][j+1] == 'e':
                answer += 1
            elif face_detector[i-1][j+1] == 'e':
              if face_detector[i][j+1] == 'c':
                answer += 1
          elif face_detector[i-1][j] == 'c':
            if face_detector[i-1][j+1] == 'a':
              if face_detector[i][j+1] == 'e':
                answer += 1
            elif face_detector[i-1][j+1] == 'e':
              if face_detector[i][j+1] == 'a':
                answer += 1
          elif face_detector[i-1][j] == 'e':
            if face_detector[i-1][j+1] == 'c':
              if face_detector[i][j+1] == 'a':
                answer += 1
            elif face_detector[i-1][j+1] == 'a':
              if face_detector[i][j+1] == 'c':
                answer += 1
      if i < n-1:
        if j > 0:
          if face_detector[i+1][j] == 'a':
            if face_detector[i+1][j-1] == 'c':
              if face_detector[i][j-1] == 'e':
                answer += 1
            elif face_detector[i+1][j-1] == 'e':
              if face_detector[i][j-1] == 'c':
                answer += 1
          elif face_detector[i+1][j] == 'c':
            if face_detector[i+1][j-1] == 'a':
              if face_detector[i][j-1] == 'e':
                answer += 1
            elif face_detector[i+1][j-1] == 'e':
              if face_detector[i][j-1] == 'a':
                answer += 1
          elif face_detector[i+1][j] == 'e':
            if face_detector[i+1][j-1] == 'c':
              if face_detector[i][j-1] == 'a':
                answer += 1
            elif face_detector[i+1][j-1] == 'a':
              if face_detector[i][j-1] == 'c':
                answer += 1
        if j < m-1:
          if face_detector[i+1][j] == 'a':
            if face_detector[i+1][j+1] == 'c':
              if face_detector[i][j+1] == 'e':
                answer += 1
            elif face_detector[i+1][j+1] == 'e':
              if face_detector[i][j+1] == 'c':
                answer += 1
          elif face_detector[i+1][j] == 'c':
            if face_detector[i+1][j+1] == 'a':
              if face_detector[i][j+1] == 'e':
                answer += 1
            elif face_detector[i+1][j+1] == 'e':
              if face_detector[i][j+1] == 'a':
                answer += 1
          elif face_detector[i+1][j] == 'e':
            if face_detector[i+1][j+1] == 'c':
              if face_detector[i][j+1] == 'a':
                answer += 1
            elif face_detector[i+1][j+1] == 'a':
              if face_detector[i][j+1] == 'c':
                answer += 1
print(answer)