js

function main (lines) {
    let text = lines[0].toLowerCase();
    let word = lines[1].toLowerCase();

    let index = text.indexOf(word);
    let counter = 0;

    while (index != -1) {
        counter++;
        index = text.indexOf(word ,index + 1);
    }

    console.log(counter);
}

let lines = ['ababa caba', 'aba'];
main(lines);