function store(input){
    let catalog={};

    for(let line of input){
        let [product,price]=line.split(" : ");
        let letter=product[0];
        if(!catalog.hasOwnProperty(letter)){
            catalog[letter]={};
        }
        catalog[letter][product]=price;

    }
   const sorted= Object.keys(catalog).sort((a,b)=>a.localeCompare(b));
    for(let key of sorted){
        console.log(key);
        const sortProduct=Object.keys(catalog[key]).sort((a,b)=>a.localeCompare(b));
        for(let product of sortProduct){
            console.log(`  ${product}: ${catalog[key][product]}`)

        }
    }

}