StringOccur

inStr = input("Enter a string: ")
dic = {a:inStr.count(a) for a in inStr}
dicRepeat = [a for a, b in dic.items() if b > 1]

tmpStr = inStr
for i in range(len(dicRepeat)):
    tmpLoc = tmpStr.index(str(dicRepeat[i]))
    tmpStr = tmpStr[:tmpLoc + 1] + tmpStr[(tmpLoc + 1):].replace(dicRepeat[i],"$")

print(tmpStr)