Merkkijono

def replace():
    global inp
    s1 = ""
    for i in range(len(inp)):
        if s1 == inp[i]:
            for j in range(i+1, len(inp)):
                if s1 != inp[j]:
                    inp = inp[:i - 1] + inp[j:]
                    return True
            inp = inp[:i-1] + inp[i+1:]
            return True
        s1 = inp[i]
    return False

inp = input()

while True:
    if not replace():
        break

print(inp)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED