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public class Solution {
    public String convertToTitle(int n) {
        
        StringBuilder sb = new StringBuilder();
        while (n > 0) {
            n--;
            int remainder = n % 26;
            sb.append((char)('A' + remainder));
            n = n / 26;
        }
        return sb.reverse().toString();
    }
}
/*
1
23
27
89
26
*/