Merkkijono

# -*- coding: utf-8 -*-
"""
Created on Tue Oct 10 09:53:04 2017

@author: visa.kovanen
"""

syote = 'FFRFHIIHFPR'

def tarkista(syote):
    b = 0
    for i in syote:
            if b < len(syote) - 1 and syote[b] == syote[b+1]:
                return True
            b += 1
    return False
def etsi_loppu(syote,eka):
    vika = eka
    while vika < len(syote)-1 and syote[vika] == syote[vika+1]:
        vika += 1
    return vika
def uusi_syote(syote,eka,vika):
    if eka == 0: 
        return syote[vika + 1:]
    else:
        a = syote[0:eka] + syote[vika+1:]
        return a

def etsi_alku(syote):
    c = 0
    for i in syote: #periaatteessa vain kopio funkitiosta tarkista
        if c < len(syote) - 1 and syote[c] == syote[c+1]:
            return c
        c += 1

def main(syote): 
    s = syote
    while tarkista(s) == True:

            eka = etsi_alku(s)
            vika = etsi_loppu(s,eka)
            s = uusi_syote(s,eka,vika)
    return s

if __name__ == "__main__":
    print(main(input()))

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED