#!/usr/bin/env python3
import fileinput
for line in fileinput.input():
if len(line) == len(set(line)): # all chars in the line are unique
print(line, end='')
IyEvdXNyL2Jpbi9lbnYgcHl0aG9uMwppbXBvcnQgZmlsZWlucHV0CiAgICAKZm9yIGxpbmUgaW4gZmlsZWlucHV0LmlucHV0KCk6CiAgICBpZiBsZW4obGluZSkgPT0gbGVuKHNldChsaW5lKSk6ICMgYWxsIGNoYXJzIGluIHRoZSBsaW5lIGFyZSB1bmlxdWUKICAgICAgICBwcmludChsaW5lLCBlbmQ9Jycp