SUPyF2 Text-Pr.-Ex. - 06. Replace Repeating Chars

"""
Text Processing - Exercise
Check your code: https://judge.softuni.bg/Contests/Practice/Index/1740#5

SUPyF2 Text-Pr.-Ex. - 06. Replace Repeating Chars

Problem:
Write a program that reads a string from the console and replaces any sequence of the same letters
 with a single corresponding letter.
Examples
Input                       Output
aaaaabbbbbcdddeeeedssaa     abcdedsa
qqqwerqwecccwd              qwerqwecwd
"""
past_letter = ""
for i in input():
    if len(past_letter) == 0:
        past_letter = i
    else:
        if i == past_letter[-1]:
            pass
        else:
            past_letter += i
print(past_letter)