const fs = require("fs")
const forwardRegex = /XMAS/g
const backwardRegex = /SAMX/g
const input = fs.readFileSync("input.txt","utf-8")
const inputArr = input.split("\n")
let totalMatches= 0;
// console.log(inputArr)
// const forwardMatchs = input.match(forwardRegex)
// console.log(input)
// console.log(forwardMatchs.length)
//create a sliding window to match the words


for (row of inputArr){
    // console.log(row)
    const forwardMatches = row.match(forwardRegex)
    const backwordsMatches= row.match(backwardRegex)

    if(forwardMatches){
        totalMatches += forwardMatches.length
    }
    if(backwordsMatches){
        totalMatches += backwordsMatches.length
    }
}

console.log("totalMatches: ",totalMatches)