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#!/usr/bin/env python
""" FNR character from Perl weekly challenge 074 task 2 """
# ===============================================================================
#
# FILE: ch-_.py
#
# USAGE: ./ch_2.py
#
# DESCRIPTION: https://perlweeklychallenge.org/blog/perl-weekly-challenge-074/
#
# TASK #2 › FNR Character
#
# AUTHOR: Lubos Kolouch
# VERSION: 1.0
# CREATED: 08/22/2020 12:40:09 PM
# ===============================================================================
def get_fnr(in_str):
""" Find and return the FNR in the given string """
fnr_count = dict()
fnr_queue = list()
result = ''
for char in in_str:
fnr_count[char] = fnr_count.get(char, 0) + 1
if fnr_count[char] == 1:
fnr_queue.append(char)
else:
fnr_queue.remove(char)
result += fnr_queue[-1] if fnr_queue else '#'
return result
assert get_fnr('ababc') == 'abb#c'
assert get_fnr('xyzzyx') == 'xyzyx#'
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