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function solution(house_trades, street_trades) {
    const sorted_house_trades = house_trades.sort();
    const sorted_street_trades = street_trades.sort();
    
    const parsed_house_trades = sorted_house_trades.map(parse);
    const house_trades_map = mapify(parsed_house_trades);
    const parsed_street_trades = sorted_street_trades.map(parse);
    const street_trades_map = mapify(parsed_street_trades);
    console.log({house_trades_map: JSON.stringify(house_trades_map), street_trades_map: JSON.stringify(street_trades_map)});
    
    filtered_house_trades = parsed_house_trades.filter(({
        string: trade,
        symbol,
        type,
        quantity,
        id,
    }) => {
        const symbolMap = street_trades_map[symbol];
        if (symbolMap == null) {
            return true;
        }
        const typeMap = symbolMap[type];
        if (typeMap == null) {
            return true;
        }
        const quantityMap = typeMap[quantity];
        if (quantityMap == null) {
            return true;
        }
        let mappedId = quantityMap[id] != null && quantityMap[id] > 0
            ? id
            : Object.keys(quantityMap).find(key => quantityMap[key] > 0);
        if (mappedId == null) {
            return true;
        }
        
        quantityMap[mappedId] = quantityMap[mappedId] - 1;
        
        return false;
    });
    
    filtered_street_trades = parsed_street_trades.filter(
        ({
        string: trade,
        symbol,
        type,
        quantity,
        id,
    }) => {
        const symbolMap = house_trades_map[symbol];
        if (symbolMap == null) {
            return true;
        }
        const typeMap = symbolMap[type];
        if (typeMap == null) {
            return true;
        }
        const quantityMap = typeMap[quantity];
        if (quantityMap == null) {
            return true;
        }
        
        let mappedId = quantityMap[id] != null && quantityMap[id] > 0
            ? id
            : Object.keys(quantityMap).find(key => quantityMap[key] > 0);
        if (mappedId == null) {
            return true;
        }
        
        quantityMap[mappedId] = quantityMap[mappedId] - 1;
        
        return false;
    });
    
    console.log({house_trades_map: JSON.stringify(house_trades_map), street_trades_map: JSON.stringify(street_trades_map)});
    console.log({filtered_house_trades, filtered_street_trades});
    
    const all_unmatched_trades = [...filtered_house_trades.map(t => t.string), ...filtered_street_trades.map(t => t.string)];
    return all_unmatched_trades.sort();
}

function parse(trade) {
    const [symbol, type, quantity, id] = trade.split(',');
    return {
        string: trade,
        symbol,
        type,
        quantity,
        id,
    };
}

function mapify(trades) {
    const map = {};
    trades.forEach(({
        string: trade,
        symbol,
        type,
        quantity,
        id,
    }) => {
        const symbolMap = (map[symbol] = map[symbol] != null ? map[symbol] : {});
        const typeMap = (symbolMap[type] = symbolMap[type] != null ? symbolMap[type] : {});
        const quantityMap = (typeMap[quantity] = typeMap[quantity] != null ? typeMap[quantity] : {});
        quantityMap[id] = quantityMap[id] != null ? quantityMap[id] + 1 : 1;
    });
    
    return map;
}