function solve(input) {
    let uniqueSymbols = [...new Set(input[0].match(/[^0-9]/g).map((x) => x.toUpperCase()))];
    let series = input[0].split(/[0-9]+/).filter((x) => x != "");
    let repeaters = input[0].split(/[^0-9]+/).filter((x) => x != "");

    console.log(`Unique symbols used: ${uniqueSymbols.length}`);

    let result = "";

    for (let i = 0; i < series.length; i++) {
        result += series[i].toUpperCase().repeat(repeaters[i]);
    }

    console.log(result);
}