const fs = require('fs');

let input = fs.readFileSync(__dirname + '/input.txt', 'utf8');

const vertical: Array<string> = input.split("\n");
const width = vertical[0].length;
const height = vertical.length;
const horizontal: Array<string> = [];
const diagonalRight: Array<string> = [];
const diagonalLeft: Array<string> = [];

for (let j = 0; j < height; j++) {
    for (let i = 0; i < width; i++) {
        if (!horizontal[i]) {
            horizontal[i] = '';
        }
        horizontal[i] += vertical[j][i];
        const leftIndex = j+i;
        if (!diagonalLeft[leftIndex]) {
            diagonalLeft[leftIndex] = '';
        }
        diagonalLeft[leftIndex] += vertical[j][i];
        const rightIndex = j - i + (Math.max(width, height)) - 1;
        if (!diagonalRight[rightIndex]) {
            diagonalRight[rightIndex] = '';
        }
        diagonalRight[rightIndex] += vertical[j][i];
    }
};

let result = 0;

[vertical, horizontal, diagonalLeft, diagonalRight].forEach((arr) => {
    arr.forEach((string) => {
        const fwMatches = string.matchAll(/XMAS/g);
        const bwMatches = string.matchAll(/SAMX/g);
        result += Array.from(fwMatches).length + Array.from(bwMatches).length;
    });
});

console.log(result);