function gameOfThrones(s) {
		//strMap stores each letter and its frequency
    const strMap = new Map([]);
		
		//oddSet stores the alphabet that appears an odd number of times in the string
    const oddSet = new Set([]);
    
    for (let i = 0; i < s.length; i++) {
				//add every unique alphabet in the strMap along with the number of times it appears in the string.
        strMap.set(s[i], (strMap.get(s[i]) ?? 0) + 1);

        if (strMap.get(s[i]) % 2 !== 0) {
				//if the frequency of the alphabet modded with 2 is not zero, it is odd and must be added to the oddSet
            oddSet.add(s[i])
        } else {
						//if its occurence is divisible by 2, it is even and we remove it from the oddSet
            oddSet.delete(s[i])
        }
    }