'use strict'
const fs = require("fs");

let data = fs.readFileSync(process.argv[3]).toString().split('\n');
let n = false,
    m = false,
    i = false,
    count_m = 0;
let string_to_find = process.argv[2],
    count = 0,
    pos = 0;

for (let j = 2; j < process.argv.length; j++) {
    if (process.argv[j] == "-n")
        n = true;
    else if (process.argv[j] == '-i')
        i = true;
    else if (process.argv[j] == '-m') {
        m = true;
        count_m = process.argv[j + 1];
    }
}

if (i) {
    for (let i = 0; i < data.length; i++)
        data[i] = data[i].toLowerCase();
    string_to_find = string_to_find.toLowerCase();
}

if (m) {
    for (let i = 0; i < data.length; i++) {
        if (data[i] !== undefined)
            while ((pos = data[i].indexOf(string_to_find, pos + 1)) != -1)
                count++;
        if (count == count_m) {
            if (n)
                console.log(`${1+i} : ${data[i]}`);
            else
                console.log(data[i]);
        }
        count = 0;
    }
} else {
    for (let i = 0; i < data.length; i++) {
        if (data[i] !== undefined && data[i].indexOf(string_to_find) > -1)
            if (n)
                console.log(`${1+i} : ${data[i]}`);
            else
                console.log(data[i]);
    }
}