function task3(inp){
    if (inp.indexOf(`<svg>`) == -1 || inp.indexOf(`</svg>`) == -1){
        return "No survey found"
    }
    inp = inp.substring(inp.indexOf(`<svg>`) + 5);
    inp = inp.substring(0, inp.indexOf(`</svg>`));

    let Cat1 = /<cat>[ ]*<text>(.|\n)*\[(.|\n)*\](.|\n)*<\/text>[ ]*<\/cat>/g;
    let Cat2 = /<cat>[ ]*((.|\n)*[ ]*<g>[ ]*<val>[ ]*([1-9]|10)[ ]*<\/val>[ ]*[0-9]+[ ]*<\/g>(.|\n)*)+<\/cat>/g;
    let values = /<g>[ ]*<val>[ ]*([1-9]|10)[ ]*<\/val>[ ]*[0-9]+[ ]*<\/g>/g;

    let Cat1Text, Cat2Text;
    try{
        Cat2Text = inp.match(Cat2)[0];
        Cat1Text = inp.match(Cat1)[0];
    }catch (err){
        return "Invalid format"
    }

    Cat1Text = Cat1Text.substring(Cat1Text.indexOf('[') + 1);
    Cat1Text = Cat1Text.substring(0, Cat1Text.indexOf(']'));

    Cat2Values = Cat2Text.match(values);

    if (Cat2Values.length <= 0){
        return "Invalid format"
    }

    let questionValues = [];
    let questionCounts = [];
    for (let i = 0; i < Cat2Values.length; i++){
        let item = Cat2Values[i] // used for answer value
        item = item.substring(item.indexOf("<val>") + 5);
        item = item.substring(0, item.indexOf("</val>")).trim();
        questionValues[i] = parseInt(item);
        let item2 = Cat2Values[i] // used for value count
        item2 = item2.substring(item2.indexOf("</val>") + 6);
        item2 = item2.substring(0, item2.indexOf("</g>")).trim();
        questionCounts[i] = parseInt(item2)

    }

    let scoreSum = 0;
    let totalScores = 0;
    for(let i = 0; i < questionValues.length; i++){
        scoreSum += questionValues[i] * questionCounts[i];
        totalScores += questionCounts[i];
    }

    let output = `${Cat1Text}: ${parseFloat((scoreSum / totalScores).toFixed(2))}`;

    return output;

}