var str = "ffaafbb";
str = str.toLowerCase();

var countOccurences = [];
var lettersSet = new Set();
for(let i = 0; i < str.length; i++) {
    lettersSet.add(str[i]);
    if (countOccurences[str[i]]) {
        countOccurences[str[i]]++;
    } else {
        countOccurences[str[i]] = 1;
    }
}

let occurrencesArr = [];
let i = 0;
for (let letter in countOccurences) {
    occurrencesArr[i] = countOccurences[letter];
    i++;
}

let differentValue = 0;
occurrencesArr.sort();
isEqual = true;
for (let i = 0 ; i < occurrencesArr.length - 1; i++) {
    if (occurrencesArr[i] != occurrencesArr[i+1]) {
        differentValue++;
    }
}
if(differentValue == 1){

    var num = occurrencesArr[0]; //1
    var lastIndex = occurrencesArr[occurrencesArr.length - 1]; //3
    var isUnique = true;
    var counter = 1;
    for (let i = 1; i <= occurrencesArr.length; i++){
        if(occurrencesArr[i] == num ){
            counter++;
            isUnique = false;
            break;
        }
    }
    if(isUnique){
        if(num == 1){
            console.log("BAD");
        } else {
            console.log("UGLY");
        }
    }
    else {
        if(lastIndex == 1){
            console.log("BAD");
        }else {
            console.log("UGLY");

       }
    }
 }
if (!isEqual) {
    console.log("UGLY")
}
else {
    let last = occurrencesArr[occurrencesArr.length - 1];
    if ((last != occurrencesArr[0] && Math.abs(last - occurrencesArr[0]) == 1))  {
        console.log("BAD")
    } else {
        console.log("GOOD")
    }
}