Python implementation using dictionary/hash table
# main function
def main():
# 'dicti' is a hash table
# 's' is string
dicti = {};
s = "asldhj aldalkd7^Awu3e8 ue8u1o2h3o82708q2"
# iterting over the string
for i in range(len(s)):
# if the character is not in hash table ,then store the character with value
==1
# and print(or store) the echaracter
if not s[i] in dicti:
dicti[s[i]] = 1
print s[i]
if __name__ == "__main__":
main()
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