import re

text: str

with open("input.txt") as f:
    text = f.read()

lines: list[str] = text.splitlines()

total: int = 0

for line1, line2, line3 in zip(lines[0:-2], lines[1:-1], lines[2:]):
    for i in range(0, len(line1) - 2):
        if (line2[i + 1] == "A"):
            total += (line1[i] == "M" and line3[i] == "M" and line1[i + 2] == "S" and line3[i + 2] == "S")
            total += (line1[i] == "M" and line3[i] == "S" and line1[i + 2] == "M" and line3[i + 2] == "S")
            total += (line1[i] == "S" and line3[i] == "S" and line1[i + 2] == "M" and line3[i + 2] == "M")
            total += (line1[i] == "S" and line3[i] == "M" and line1[i + 2] == "S" and line3[i + 2] == "M")
                

print(total)