Merkkijono

s = input()

def onkosama(pointer):
    if (pointer < len(s)-1):
        if (s[pointer]==s[pointer+1]):
            return onkosama(pointer+1)+1
    return 0


p = 0
while(p < len(s)-1):
    e = onkosama(p)
    if (e != 0):
        s = s[:p]+s[p+e+1:]
        if (p != 0):
            p = p-1
    else:
        p = p + 1

print(s)

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