function travelTime(input){
let destination = {}
while(input.length>0){
    [country, town, cost] = input.shift().split(" > ")
    cost=Number(cost)

    if(destination.hasOwnProperty(country)){
        if(destination[country].hasOwnProperty(town)){
            let price = destination[country][town]
            if(price>cost){
                destination[country][town]=cost
            }

        }else {
            destination[country][town]=cost
        }
    }else{
        destination[country] = {
            [town]:cost
        }
    }

}
for(let country of Object.keys(destination).sort((a,b)=>a.localeCompare(b))){

    let forPrint = country + " -> "
    let entries = Object.entries(destination[country]).sort(([a,valA],[b,valB])=> valA - valB)
    for(let [key, valuea] of entries){
        forPrint+= key+ " -> "+ valuea + " "
    }
    console.log(forPrint)
}
}