In this task, you are given a string of characters. You need to remove duplicate characters from the string if any, and return the resulting string.

Input: Consider Input: BOPbKEiInAGqyixJWhkPkbCGMCxjj

Output: BOPbKEiInAGqyxJWhkCMj


Input: Consider Input: yxTlQSKsXczzwVbftQmlSyDnudusMZ

Output: yxTlQSKsXczwVbftmDnudMZ


Input: Consider Input: FADtggVHWPgSKcVnyvGF


Output: FADtgVHWPSKcnyvG